X-Git-Url: https://git.donarmstrong.com/?a=blobdiff_plain;f=ly%2Fmusic-functions-init.ly;h=fc49725f07d395cf4eec1832db6b9283a96f3a55;hb=2613eed0a13ce118cb11f83057d9d79fc6973a4e;hp=2c6236a1e1044a2b5d3587901a852b2f12f4c84f;hpb=cc7fed7a46b070f6916d4307455dd9f56161e0b2;p=lilypond.git

diff --git a/ly/music-functions-init.ly b/ly/music-functions-init.ly
index 2c6236a1e1..fc49725f07 100644
--- a/ly/music-functions-init.ly
+++ b/ly/music-functions-init.ly
@@ -1,235 +1,338 @@
-% -*-Scheme-*-
-
-\version "2.12.0"
+%%%% -*- Mode: Scheme -*-
+
+%%%% This file is part of LilyPond, the GNU music typesetter.
+%%%%
+%%%% Copyright (C) 2003--2011 Han-Wen Nienhuys <hanwen@xs4all.nl>
+%%%%                          Jan Nieuwenhuizen <janneke@gnu.org>
+%%%%
+%%%% LilyPond is free software: you can redistribute it and/or modify
+%%%% it under the terms of the GNU General Public License as published by
+%%%% the Free Software Foundation, either version 3 of the License, or
+%%%% (at your option) any later version.
+%%%%
+%%%% LilyPond is distributed in the hope that it will be useful,
+%%%% but WITHOUT ANY WARRANTY; without even the implied warranty of
+%%%% MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+%%%% GNU General Public License for more details.
+%%%%
+%%%% You should have received a copy of the GNU General Public License
+%%%% along with LilyPond.  If not, see <http://www.gnu.org/licenses/>.
+
+\version "2.13.29"
 
 
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 %% this file is alphabetically sorted.
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 
-%% need SRFI-1 filter 
+%% need SRFI-1 for filter; optargs for lambda*
+#(use-modules (srfi srfi-1)
+	      (ice-9 optargs))
 
-#(use-modules (srfi srfi-1))
+%% TODO: using define-music-function in a .scm causes crash.
 
 acciaccatura =
-#(def-grace-function startAcciaccaturaMusic stopAcciaccaturaMusic)
+#(def-grace-function startAcciaccaturaMusic stopAcciaccaturaMusic
+   (_i "Create an acciaccatura from the following music expression"))
+
+%% keep these two together
+"instrument-definitions" = #'()
+addInstrumentDefinition =
+#(define-music-function
+   (parser location name lst) (string? list?)
+   (_i "Create instrument @var{name} with properties @var{list}.")
+   (set! instrument-definitions (acons name lst instrument-definitions))
+   (make-music 'SequentialMusic 'void #t))
 
 addQuote =
 #(define-music-function (parser location name music) (string? ly:music?)
-   (_i "Add a piece of music to be quoted ")
+   (_i "Define @var{music} as a quotable music expression named
+@var{name}")
    (add-quotable parser name music)
    (make-music 'SequentialMusic 'void #t))
 
-afterGraceFraction =
-#(cons 6 8)
-
+%% keep these two together
+afterGraceFraction = #(cons 6 8)
 afterGrace =
-#(define-music-function
-  (parser location main grace)
-  (ly:music? ly:music?)
-
-  (let*
-      ((main-length (ly:music-length main))
-       (fraction  (ly:parser-lookup parser 'afterGraceFraction)))
-    
-    (make-simultaneous-music
-     (list
-      main
-      (make-sequential-music
-       (list
-
-	(make-music 'SkipMusic
-		    'duration (ly:make-duration
-			       0 0
-			       (* (ly:moment-main-numerator main-length)
-				  (car fraction))
-			       (* (ly:moment-main-denominator main-length)
-				  (cdr fraction)) ))
-	(make-music 'GraceMusic
-		    'element grace)))))))
+#(define-music-function (parser location main grace) (ly:music? ly:music?)
+   (_i "Create @var{grace} note(s) after a @var{main} music expression.")
+   (let ((main-length (ly:music-length main))
+	 (fraction  (ly:parser-lookup parser 'afterGraceFraction)))
+     (make-simultaneous-music
+      (list
+       main
+       (make-sequential-music
+	(list
+
+	 (make-music 'SkipMusic
+		     'duration (ly:make-duration
+				0 0
+				(* (ly:moment-main-numerator main-length)
+				   (car fraction))
+				(* (ly:moment-main-denominator main-length)
+				   (cdr fraction))))
+	 (make-music 'GraceMusic
+		     'element grace)))))))
+
+
+%% music identifiers not allowed at top-level,
+%% so this is a music-function instead.
+allowPageTurn =
+#(define-music-function (location parser) ()
+   (_i "Allow a page turn. May be used at toplevel (ie between scores or
+markups), or inside a score.")
+   (make-music 'EventChord
+	       'page-marker #t
+	       'page-turn-permission 'allow
+	       'elements (list (make-music 'PageTurnEvent
+					   'break-permission 'allow))))
+
+applyContext =
+#(define-music-function (parser location proc) (procedure?)
+   (_i "Modify context properties with Scheme procedure @var{proc}.")
+   (make-music 'ApplyContext
+	       'procedure proc))
 
 applyMusic =
 #(define-music-function (parser location func music) (procedure? ly:music?)
-               (func music))
-
+   (_i"Apply procedure @var{func} to @var{music}.")
+   (func music))
 
 applyOutput =
 #(define-music-function (parser location ctx proc) (symbol? procedure?)
-                (make-music 'ApplyOutputEvent
-                  'origin location
-                  'procedure proc
-                  'context-type ctx))
+   (_i "Apply function @code{proc} to every layout object in context @code{ctx}")
+   (make-music 'ApplyOutputEvent
+	       'procedure proc
+	       'context-type ctx))
 
 appoggiatura =
-#(def-grace-function startAppoggiaturaMusic stopAppoggiaturaMusic)
-
-
+#(def-grace-function startAppoggiaturaMusic stopAppoggiaturaMusic
+   (_i "Create an appoggiatura from @var{music}"))
 
 % for regression testing purposes.
 assertBeamQuant =
 #(define-music-function (parser location l r) (pair? pair?)
-  (make-grob-property-override 'Beam 'positions
-   (ly:make-simple-closure
-    (ly:make-simple-closure
-     (append
-      (list chain-grob-member-functions `(,cons 0 0))
-      (check-quant-callbacks l r))))))
-    
+   (_i "Testing function: check whether the beam quants @var{l} and @var{r} are correct")
+   (make-grob-property-override 'Beam 'positions
+				(ly:make-simple-closure
+				 (ly:make-simple-closure
+				  (append
+				   (list chain-grob-member-functions `(,cons 0 0))
+				   (check-quant-callbacks l r))))))
+
 % for regression testing purposes.
 assertBeamSlope =
 #(define-music-function (parser location comp) (procedure?)
-  (make-grob-property-override 'Beam 'positions
-   (ly:make-simple-closure
-    (ly:make-simple-closure
-     (append
-      (list chain-grob-member-functions `(,cons 0 0))
-      (check-slope-callbacks comp))))))
-
-
+   (_i "Testing function: check whether the slope of the beam is the same as @code{comp}")
+   (make-grob-property-override 'Beam 'positions
+				(ly:make-simple-closure
+				 (ly:make-simple-closure
+				  (append
+				   (list chain-grob-member-functions `(,cons 0 0))
+				   (check-slope-callbacks comp))))))
 
 autochange =
 #(define-music-function (parser location music) (ly:music?)
-               (make-autochange-music parser music))
+   (_i "Make voices that switch between staves automatically")
+   (make-autochange-music parser music))
 
-applyContext =
-#(define-music-function (parser location proc) (procedure?)
-                 (make-music 'ApplyContext 
-                   'origin location
-                   'procedure proc))
 
 
 balloonGrobText =
-#(define-music-function (parser location grob-name offset text) (symbol? number-pair? markup?)
-   
-    (make-music 'AnnotateOutputEvent
-		'symbol grob-name
-		'X-offset (car offset)
-		'Y-offset (cdr offset)
-		'text text))
+#(define-music-function (parser location grob-name offset text)
+   (symbol? number-pair? markup?)
+   (_i "Attach @var{text} to @var{grob-name} at offset @var{offset}
+ (use like @code{\\once})")
+   (make-music 'AnnotateOutputEvent
+	       'symbol grob-name
+	       'X-offset (car offset)
+	       'Y-offset (cdr offset)
+	       'text text))
 
 balloonText =
 #(define-music-function (parser location offset text) (number-pair? markup?)
-   
-    (make-music 'AnnotateOutputEvent
-		'X-offset (car offset)
-		'Y-offset (cdr offset)
-		'text text))
-
+   (_i "Attach @var{text} at @var{offset} (use like @code{\\tweak})")
+   (make-music 'AnnotateOutputEvent
+	       'X-offset (car offset)
+	       'Y-offset (cdr offset)
+	       'text text))
 
 bar =
-#(define-music-function (parser location type)
-   (string?)
+#(define-music-function (parser location type) (string?)
+   (_i "Insert a bar line of type @var{type}")
    (context-spec-music
     (make-property-set 'whichBar type)
     'Timing))
 
-
 barNumberCheck =
 #(define-music-function (parser location n) (integer?)
-  (_i "Print a warning if the current bar number is not @var{n}.")
-   (make-music 'ApplyContext 
-	       'origin location
-	       'procedure 
+   (_i "Print a warning if the current bar number is not @var{n}.")
+   (make-music 'ApplyContext
+	       'procedure
 	       (lambda (c)
-		 (let*
-		     ((cbn (ly:context-property c 'currentBarNumber)))
+		 (let ((cbn (ly:context-property c 'currentBarNumber)))
 		   (if (and  (number? cbn) (not (= cbn n)))
-		       (ly:input-message location "Barcheck failed got ~a expect ~a"
+		       (ly:input-message location
+					 "Barcheck failed got ~a expect ~a"
 					 cbn n))))))
 
-
 bendAfter =
 #(define-music-function (parser location delta) (real?)
-  (_i "Create a fall or doit of pitch interval @var{delta}.")
-  (make-music 'BendAfterEvent
-   'delta-step delta))
+   (_i "Create a fall or doit of pitch interval @var{delta}.")
+   (make-music 'BendAfterEvent
+	       'delta-step delta))
+
+bookOutputName =
+#(define-music-function (parser location newfilename) (string?)
+   (_i "Direct output for the current book block to @var{newfilename}.")
+   (set! book-filename newfilename)
+   (make-music 'SequentialMusic 'void #t))
+
+bookOutputSuffix =
+#(define-music-function (parser location newsuffix) (string?)
+   (_i "Set the output filename suffix for the current book block to
+@var{newsuffix}.")
+   (set! book-output-suffix newsuffix)
+   (make-music 'SequentialMusic 'void #t))
 
-%% why a function?
+%% \breathe is defined as a music function rather than an event identifier to
+%% ensure it gets useful input location information: as an event identifier,
+%% it would have to be wrapped in an EventChord to prevent it from being
+%% treated as a post_event by the parser
 breathe =
 #(define-music-function (parser location) ()
-  (_i "Insert a breath mark.")
-            (make-music 'EventChord 
-              'origin location
-              'elements (list (make-music 'BreathingEvent))))
+   (_i "Insert a breath mark.")
+   (make-music 'BreathingEvent))
+
 
 
 clef =
 #(define-music-function (parser location type) (string?)
-  (_i "Set the current clef to @var{type}.")
+   (_i "Set the current clef to @var{type}.")
    (make-clef-set type))
 
 
-cueDuring = 
+compoundMeter =
+#(define-music-function (parser location args) (pair?)
+  (_i "Create compound time signatures. The argument is a Scheme list of 
+lists. Each list describes one fraction, with the last entry being the 
+denominator, while the first entries describe the summands in the 
+enumerator. If the time signature consists of just one fraction, 
+the list can be given directly, i.e. not as a list containing a single list.
+For example, a time signature of (3+1)/8 + 2/4 would be created as 
+@code{\\compoundMeter #'((3 1 8) (2 4))}, and a time signature of (3+2)/8 
+as @code{\\compoundMeter #'((3 2 8))} or shorter 
+@code{\\compoundMeter #'(3 2 8)}.")
+  (let* ((mlen (calculate-compound-measure-length args))
+         (beat (calculate-compound-base-beat args))
+         (beatGrouping (calculate-compound-beat-grouping args))
+         (timesig (cons (ly:moment-main-numerator mlen)
+                        (ly:moment-main-denominator mlen))))
+  #{
+    \once \override Staff.TimeSignature #'stencil = #(lambda (grob)
+		(grob-interpret-markup grob (format-compound-time $args)))
+    \set Timing.timeSignatureFraction = $timesig
+    \set Timing.baseMoment = $beat
+    \set Timing.beatStructure = $beatGrouping
+    \set Timing.beamExceptions = #'()
+    \set Timing.measureLength = $mlen
+  #} ))
+
+
+cueClef =
+#(define-music-function (parser location type) (string?)
+  (_i "Set the current cue clef to @var{type}.")
+  (make-cue-clef-set type))
+cueClefUnset =
+#(define-music-function (parser location) ()
+  (_i "Unset the current cue clef.")
+  (make-cue-clef-unset))
+
+cueDuring =
+#(define-music-function
+   (parser location what dir main-music) (string? ly:dir? ly:music?)
+   (_i "Insert contents of quote @var{what} corresponding to @var{main-music},
+in a CueVoice oriented by @var{dir}.")
+   (make-music 'QuoteMusic
+	       'element main-music
+	       'quoted-context-type 'Voice
+	       'quoted-context-id "cue"
+	       'quoted-music-name what
+	       'quoted-voice-direction dir))
+
+cueDuringWithClef =
 #(define-music-function
-  (parser location what dir main-music) (string? ly:dir? ly:music?)
-  (_i "Insert contents of quote @var{what} corresponding to @var{main-music},
+   (parser location what dir clef main-music) (string? ly:dir? string? ly:music?)
+   (_i "Insert contents of quote @var{what} corresponding to @var{main-music},
 in a CueVoice oriented by @var{dir}.")
-  (make-music 'QuoteMusic
-	      'element main-music 
-	      'quoted-context-type 'Voice
-	      'quoted-context-id "cue"
-	      'quoted-music-name what
-	      'quoted-voice-direction dir
-	      'origin location))
+   (make-music 'QuoteMusic
+	       'element main-music
+	       'quoted-context-type 'Voice
+	       'quoted-context-id "cue"
+	       'quoted-music-name what
+	       'quoted-music-clef clef
+	       'quoted-voice-direction dir))
+
+
 
 displayLilyMusic =
 #(define-music-function (parser location music) (ly:music?)
-  (_i "Display  @var{music} to the console in LilyPond input notation.")
+   (_i "Display the LilyPond input representation of @var{music}
+to the console.")
    (newline)
    (display-lily-music music parser)
    music)
 
 displayMusic =
 #(define-music-function (parser location music) (ly:music?)
-  (_i "Display the internal representation of @var{music} to the console.")
+   (_i "Display the internal representation of @var{music} to the console.")
    (newline)
    (display-scheme-music music)
    music)
 
 
+
 endSpanners =
 #(define-music-function (parser location music) (ly:music?)
-  (_i "Terminate the next spanner prematurely after exactly one note without the need of a specific end spanner.")
+   (_i "Terminate the next spanner prematurely after exactly one note
+without the need of a specific end spanner.")
    (if (eq? (ly:music-property music 'name) 'EventChord)
-       (let*
-	   ((elts (ly:music-property music 'elements))
-	    (start-span-evs (filter (lambda (ev)
-				(and (music-has-type ev 'span-event)
-				     (equal? (ly:music-property ev 'span-direction)
-					     START)))
-			      elts))
-	    (stop-span-evs
-	     (map (lambda (m)
-		    (let* ((c (music-clone m)))
-		      (set! (ly:music-property c 'span-direction) STOP)
-		      c))
-		  start-span-evs))
-	    (end-ev-chord (make-music 'EventChord
-				      'elements stop-span-evs))
-	    (total (make-music 'SequentialMusic
-			       'elements (list music
-					       end-ev-chord))))
+       (let* ((elts (ly:music-property music 'elements))
+	      (start-span-evs (filter (lambda (ev)
+					(and (music-has-type ev 'span-event)
+					     (equal? (ly:music-property ev 'span-direction)
+						     START)))
+				      elts))
+	      (stop-span-evs
+	       (map (lambda (m)
+		      (let ((c (music-clone m)))
+			(set! (ly:music-property c 'span-direction) STOP)
+			c))
+		    start-span-evs))
+	      (end-ev-chord (make-music 'EventChord
+					'elements stop-span-evs))
+	      (total (make-music 'SequentialMusic
+				 'elements (list music
+						 end-ev-chord))))
 	 total)
-       
+
        (ly:input-message location (_ "argument endSpanners is not an EventChord: ~a" music))))
 
+
+
 featherDurations=
 #(define-music-function (parser location factor argument) (ly:moment? ly:music?)
-   (_i "Rearrange durations in ARGUMENT so there is an
-acceleration/deceleration. ")
-   
-   (let*
-       ((orig-duration (ly:music-length argument))
-	(multiplier (ly:make-moment 1 1)))
-
-     (music-map 
+   (_i "Adjust durations of music in @var{argument} by rational @var{factor}.")
+   (let ((orig-duration (ly:music-length argument))
+	 (multiplier (ly:make-moment 1 1)))
+
+     (music-map
       (lambda (mus)
 	(if (and (eq? (ly:music-property mus 'name) 'EventChord)
 		 (< 0 (ly:moment-main-denominator (ly:music-length mus))))
 	    (begin
 	      (ly:music-compress mus multiplier)
-	      (set! multiplier (ly:moment-mul factor multiplier)))
-	    )
+	      (set! multiplier (ly:moment-mul factor multiplier))))
 	mus)
       argument)
 
@@ -239,31 +342,50 @@ acceleration/deceleration. ")
 
      argument))
 
-grace =
-#(def-grace-function startGraceMusic stopGraceMusic)
 
 
-"instrument-definitions" = #'()
-
-addInstrumentDefinition =
-#(define-music-function
-   (parser location name lst) (string? list?)
-
-   (set! instrument-definitions (acons name lst instrument-definitions))
-
-   (make-music 'SequentialMusic 'void #t))
-
+grace =
+#(def-grace-function startGraceMusic stopGraceMusic
+   (_i "Insert @var{music} as grace notes."))
+
+harmonicByFret = #(define-music-function (parser location fret music) (number? ly:music?)
+  (let* ((fret (number->string fret))
+         (pitch (fret->pitch fret)))
+        (make-sequential-music
+         (list
+          #{
+            \override TabNoteHead #'stencil = #(tab-note-head::print-custom-fret-label $fret)
+          #}
+          (make-harmonic
+            (calc-harmonic-pitch pitch music))
+          #{
+            \revert TabNoteHead #'stencil
+          #}))))
+
+harmonicByRatio = #(define-music-function (parser location ratio music) (number? ly:music?)
+  (let ((pitch (ratio->pitch ratio))
+        (fret (ratio->fret ratio)))
+       (make-sequential-music
+        (list
+         #{
+           \override TabNoteHead #'stencil = #(tab-note-head::print-custom-fret-label $fret)
+         #}
+         (make-harmonic
+           (calc-harmonic-pitch pitch music))
+         #{
+            \revert TabNoteHead #'stencil
+         #}))))
 
 instrumentSwitch =
 #(define-music-function
    (parser location name) (string?)
-   (let*
-       ((handle  (assoc name instrument-definitions))
-	(instrument-def (if handle (cdr handle) '()))
-	)
+   (_i "Switch instrument to @var{name}, which must be predefined with
+@code{\\addInstrumentDefinition}.")
+   (let* ((handle (assoc name instrument-definitions))
+	  (instrument-def (if handle (cdr handle) '())))
 
      (if (not handle)
-	 (ly:input-message "No such instrument: ~a" name))
+	 (ly:input-message location "No such instrument: ~a" name))
      (context-spec-music
       (make-music 'SimultaneousMusic
 		  'elements
@@ -275,100 +397,139 @@ instrumentSwitch =
       'Staff)))
 
 
-%% Parser used to read page-layout file, and then retreive score tweaks.
-#(define page-layout-parser #f)
-
-includePageLayoutFile = 
-#(define-music-function (parser location) ()
-   (_i "If page breaks and tweak dump is not asked, and the file
-<basename>-page-layout.ly exists, include it.")
-   (if (not (ly:get-option 'dump-tweaks))
-       (let ((tweak-filename (format #f "~a-page-layout.ly"
-				     (ly:parser-output-name parser))))
-	 (if (access? tweak-filename R_OK)
-	     (begin
-	       (ly:message "Including tweak file ~a" tweak-filename)
-               (set! page-layout-parser (ly:parser-clone parser))
-	       (ly:parser-parse-string page-layout-parser
-                                       (format #f "\\include \"~a\""
-                                               tweak-filename))))))
-   (make-music 'SequentialMusic 'void #t))
-
-
 
 keepWithTag =
-#(define-music-function
-  (parser location tag music) (symbol? ly:music?)
-  (music-filter
-   (lambda (m)
-    (let* ((tags (ly:music-property m 'tags))
-           (res (memq tag tags)))
-     (or
-      (eq? tags '())
-      res)))
-   music))
-
-removeWithTag = 
-#(define-music-function
-  (parser location tag music) (symbol? ly:music?)
-  (music-filter
-   (lambda (m)
-    (let* ((tags (ly:music-property m 'tags))
-           (res (memq tag tags)))
-     (not res)))
- music))
+#(define-music-function (parser location tag music) (symbol? ly:music?)
+   (_i "Include only elements of @var{music} that are tagged with @var{tag}.")
+   (music-filter
+    (lambda (m)
+      (let* ((tags (ly:music-property m 'tags))
+	     (res (memq tag tags)))
+	(or
+	 (eq? tags '())
+	 res)))
+    music))
 
 killCues =
-#(define-music-function
-   (parser location music)
-   (ly:music?)
+#(define-music-function (parser location music) (ly:music?)
+   (_i "Remove cue notes from @var{music}.")
    (music-map
     (lambda (mus)
-      (if (string? (ly:music-property mus 'quoted-music-name))
+      (if (and (string? (ly:music-property mus 'quoted-music-name))
+	       (string=? (ly:music-property mus 'quoted-context-id "") "cue"))
 	  (ly:music-property mus 'element)
-	  mus)) music))
+	  mus))
+    music))
+
+
 
-label = 
+label =
 #(define-music-function (parser location label) (symbol?)
-   (_i "Place a bookmarking label, either at top-level or inside music.")
+   (_i "Create @var{label} as a bookmarking label.")
    (make-music 'EventChord
 	       'page-marker #t
 	       'page-label label
 	       'elements (list (make-music 'LabelEvent
-					   'page-label label)))) 
+					   'page-label label))))
+
+
+language =
+#(define-music-function (parser location language) (string?)
+   (_i "Set note names for language @var{language}.")
+   (note-names-language parser language)
+   (make-music 'Music 'void #t))
+
+languageSaveAndChange =
+#(define-music-function (parser location language) (string?)
+  (_i "Store the previous pitchnames alist, and set a new one.")
+  (set! previous-pitchnames pitchnames)
+  (note-names-language parser language)
+  (make-music 'Music 'void #t))
+
+languageRestore =
+#(define-music-function (parser location) ()
+   (_i "Restore a previously-saved pitchnames alist.")
+   (if previous-pitchnames
+       (begin
+        (set! pitchnames previous-pitchnames)
+        (ly:parser-set-note-names parser pitchnames))
+      (ly:warning (_ "No other language was defined previously. Ignoring.")))
+   (make-music 'Music 'void #t))
+
 
 makeClusters =
-#(define-music-function
-		(parser location arg) (ly:music?)
-		(music-map note-to-cluster arg))
+#(define-music-function (parser location arg) (ly:music?)
+   (_i "Display chords in @var{arg} as clusters.")
+   (music-map note-to-cluster arg))
 
 musicMap =
 #(define-music-function (parser location proc mus) (procedure? ly:music?)
-	     (music-map proc mus))
+   (_i "Apply @var{proc} to @var{mus} and all of the music it contains.")
+   (music-map proc mus))
 
 
 
-oldaddlyrics =
-#(define-music-function (parser location music lyrics) (ly:music? ly:music?)
+%% noPageBreak and noPageTurn are music functions (not music indentifiers),
+%% because music identifiers are not allowed at top-level.
+noPageBreak =
+#(define-music-function (location parser) ()
+   (_i "Forbid a page break.  May be used at toplevel (i.e., between scores or
+markups), or inside a score.")
+   (make-music 'EventChord
+	       'page-marker #t
+	       'page-break-permission 'forbid
+	       'elements (list (make-music 'PageBreakEvent
+					   'break-permission '()))))
+
+noPageTurn =
+#(define-music-function (location parser) ()
+   (_i "Forbid a page turn.  May be used at toplevel (i.e., between scores or
+markups), or inside a score.")
+   (make-music 'EventChord
+	       'page-marker #t
+	       'page-turn-permission 'forbid
+	       'elements (list (make-music 'PageTurnEvent
+					   'break-permission '()))))
+
 
-              (make-music 'OldLyricCombineMusic 
-                          'origin location
-                          'elements (list music lyrics)))
 
+octaveCheck =
+#(define-music-function (parser location pitch-note) (ly:music?)
+   (_i "Octave check.")
+   (make-music 'RelativeOctaveCheck
+	       'pitch (pitch-of-note pitch-note)))
+
+ottava =
+#(define-music-function (parser location octave) (integer?)
+   (_i "Set the octavation.")
+   (make-music 'OttavaMusic
+	       'ottava-number octave))
+
+overrideTimeSignatureSettings =
+#(define-music-function
+   (parser location time-signature base-moment beat-structure beam-exceptions)
+   (pair? pair? cheap-list? cheap-list?)
+
+   (_i "Override @code{timeSignatureSettings}
+for time signatures of @var{time-signature} to have settings
+of @var{base-moment}, @var{beat-structure}, and @var{beam-exceptions}.")
+
+   ;; TODO -- add warning if largest value of grouping is
+   ;;	    greater than time-signature.
+  (let ((setting (make-setting base-moment beat-structure beam-exceptions)))
+    (override-time-signature-setting time-signature setting)))
 
 overrideProperty =
 #(define-music-function (parser location name property value)
    (string? symbol? scheme?)
 
-
    (_i "Set @var{property} to @var{value} in all grobs named @var{name}.
 The @var{name} argument is a string of the form @code{\"Context.GrobName\"}
-or @code{\"GrobName\"}")
+or @code{\"GrobName\"}.")
 
-   (let*
-       ((name-components (string-split name #\.))
-	(context-name 'Bottom)
-	(grob-name #f))
+   (let ((name-components (string-split name #\.))
+	 (context-name 'Bottom)
+	 (grob-name #f))
 
      (if (> 2 (length name-components))
 	 (set! grob-name (string->symbol (car name-components)))
@@ -377,7 +538,6 @@ or @code{\"GrobName\"}")
 	   (set! context-name (string->symbol (list-ref name-components 0)))))
 
      (make-music 'ApplyOutputEvent
-		 'origin location
 		 'context-type context-name
 		 'procedure
 		 (lambda (grob orig-context context)
@@ -386,11 +546,13 @@ or @code{\"GrobName\"}")
 			grob-name)
 		       (set! (ly:grob-property grob property) value))))))
 
-%% These are music functions (iso music indentifiers), because music identifiers
-%% are not allowed at top-level.
+
+
+%% pageBreak and pageTurn are music functions (iso music indentifiers),
+%% because music identifiers are not allowed at top-level.
 pageBreak =
 #(define-music-function (location parser) ()
-   (_i "Force a page break. May be used at toplevel (ie between scores or
+   (_i "Force a page break.  May be used at toplevel (i.e., between scores or
 markups), or inside a score.")
    (make-music 'EventChord
 	       'page-marker #t
@@ -401,20 +563,10 @@ markups), or inside a score.")
 			       (make-music 'PageBreakEvent
 					   'break-permission 'force))))
 
-noPageBreak =
-#(define-music-function (location parser) ()
-   (_i "Forbid a page break. May be used at toplevel (ie between scores or
-markups), or inside a score.")
-   (make-music 'EventChord
-	       'page-marker #t
-	       'page-break-permission 'forbid
-	       'elements (list (make-music 'PageBreakEvent
-					   'break-permission '()))))
-
 pageTurn =
 #(define-music-function (location parser) ()
    (_i "Force a page turn between two scores or top-level markups.")
-   (make-music 'EventChord 
+   (make-music 'EventChord
 	       'page-marker #t
 	       'line-break-permission 'force
 	       'page-break-permission 'force
@@ -426,88 +578,9 @@ pageTurn =
 			       (make-music 'PageTurnEvent
 					   'break-permission 'force))))
 
-noPageTurn =
-#(define-music-function (location parser) ()
-   (_i "Forbid a page turn. May be used at toplevel (ie between scores or
-markups), or inside a score.")
-   (make-music 'EventChord
-	       'page-marker #t
-	       'page-turn-permission 'forbid
-	       'elements (list (make-music 'PageTurnEvent
-					   'break-permission '()))))
-
-allowPageTurn =
-#(define-music-function (location parser) ()
-   (_i "Allow a page turn. May be used at toplevel (ie between scores or
-markups), or inside a score.")
-   (make-music 'EventChord
-	       'page-marker #t
-	       'page-turn-permission 'allow
-	       'elements (list (make-music 'PageTurnEvent
-					   'break-permission 'allow))))
-
-%% Todo:
-%% doing
-%% define-music-function in a .scm causes crash.
-
-octaveCheck =
-#(define-music-function (parser location pitch-note) (ly:music?)
-   (_i "octave check")
-
-   (make-music 'RelativeOctaveCheck
-	       'origin location
-	       'pitch (pitch-of-note pitch-note) 
-           ))
-
-ottava = #(define-music-function (parser location octave) (number?)
-  (_i "set the octavation ")
-  (make-ottava-set octave))
-
-partcombine =
-#(define-music-function (parser location part1 part2) (ly:music? ly:music?)
-                (make-part-combine-music parser
-					 (list part1 part2)))
-
-	      
-pitchedTrill =
-#(define-music-function
-   (parser location main-note secondary-note)
-   (ly:music? ly:music?)
-   (let*
-       ((get-notes (lambda (ev-chord)
-		     (filter
-		      (lambda (m) (eq? 'NoteEvent (ly:music-property m 'name)))
-		      (ly:music-property ev-chord 'elements))))
-	(sec-note-events (get-notes secondary-note))
-	(trill-events (filter (lambda (m) (music-has-type m 'trill-span-event))
-			      (ly:music-property main-note 'elements))))
-
-     (if (pair? sec-note-events)
-	 (begin
-	   (let*
-	       ((trill-pitch (ly:music-property (car sec-note-events) 'pitch))
-		(forced (ly:music-property (car sec-note-events ) 'force-accidental)))
-	     
-	     (if (ly:pitch? trill-pitch)
-		 (for-each (lambda (m) (ly:music-set-property! m 'pitch trill-pitch))
-			   trill-events)
-		 (begin
-		   (ly:warning (_ "Second argument of \\pitchedTrill should be single note: "))
-		   (display sec-note-events)))
-
-	     (if (eq? forced #t)
-		 (for-each (lambda (m) (ly:music-set-property! m 'force-accidental forced))
-			   trill-events)))))
-     main-note))
-
-
-
-%% for lambda*
-#(use-modules (ice-9 optargs))
-
 parallelMusic =
 #(define-music-function (parser location voice-ids music) (list? ly:music?)
-  (_i "Define parallel music sequences, separated by '|' (bar check signs),
+   (_i "Define parallel music sequences, separated by '|' (bar check signs),
 and assign them to the identifiers provided in @var{voice-ids}.
 
 @var{voice-ids}: a list of music identifiers (symbols containing only letters)
@@ -527,135 +600,222 @@ Example:
   C = { e e | f f | }
 @end verbatim
 ")
-  (let* ((voices (apply circular-list (make-list (length voice-ids) (list))))
-         (current-voices voices)
-         (current-sequence (list)))
-    ;;
-    ;; utilities
-    (define (push-music m)
-      "Push the music expression into the current sequence"
-      (set! current-sequence (cons m current-sequence)))
-    (define (change-voice)
-      "Stores the previously built sequence into the current voice and
+   (let* ((voices (apply circular-list (make-list (length voice-ids) (list))))
+	  (current-voices voices)
+	  (current-sequence (list)))
+     ;;
+     ;; utilities
+     (define (push-music m)
+       "Push the music expression into the current sequence"
+       (set! current-sequence (cons m current-sequence)))
+     (define (change-voice)
+       "Stores the previously built sequence into the current voice and
        change to the following voice."
-      (list-set! current-voices 0 (cons (make-music 'SequentialMusic 
-                                         'elements (reverse! current-sequence))
-                                        (car current-voices)))
-      (set! current-sequence (list))
-      (set! current-voices (cdr current-voices)))
-    (define (bar-check? m)
-      "Checks whether m is a bar check."
-      (eq? (ly:music-property m 'name) 'BarCheck))
-    (define (music-origin music)
-      "Recursively search an origin location stored in music."
-      (cond ((null? music) #f)
-            ((not (null? (ly:music-property music 'origin)))
-             (ly:music-property music 'origin))
-            (else (or (music-origin (ly:music-property music 'element))
-                      (let ((origins (remove not (map music-origin 
-                                                      (ly:music-property music 'elements)))))
-                        (and (not (null? origins)) (car origins)))))))
-    ;;
-    ;; first, split the music and fill in voices
-    (map-in-order (lambda (m)
-                    (push-music m)
-                    (if (bar-check? m) (change-voice)))
-                  (ly:music-property music 'elements))
-    (if (not (null? current-sequence)) (change-voice))
-    ;; un-circularize `voices' and reorder the voices
-    (set! voices (map-in-order (lambda (dummy seqs)
-                                 (reverse! seqs))
-                               voice-ids voices))
-    ;;
-    ;; set origin location of each sequence in each voice
-    ;; for better type error tracking
-    (for-each (lambda (voice)
-                (for-each (lambda (seq)
-                            (set! (ly:music-property seq 'origin)
-                                  (or (music-origin seq) location)))
-                          voice))
-              voices)
-    ;;
-    ;; check sequence length
-    (apply for-each (lambda* (#:rest seqs)
-                      (let ((moment-reference (ly:music-length (car seqs))))
-                        (for-each (lambda (seq moment)
-                                    (if (not (equal? moment moment-reference))
-                                        (ly:music-message seq 
-                                         "Bars in parallel music don't have the same length")))
-                          seqs (map-in-order ly:music-length seqs))))
-           voices)
-   ;;
-   ;; bind voice identifiers to the voices
-   (map (lambda (voice-id voice)
-          (ly:parser-define! parser voice-id 
-                             (make-music 'SequentialMusic 
-                               'origin location
-                               'elements voice)))
-        voice-ids voices))
- ;; Return an empty sequence. this function is actually a "void" function.
- (make-music 'SequentialMusic 'void #t))
-
-
+       (list-set! current-voices 0 (cons (make-music 'SequentialMusic
+						     'elements (reverse! current-sequence))
+					 (car current-voices)))
+       (set! current-sequence (list))
+       (set! current-voices (cdr current-voices)))
+     (define (bar-check? m)
+       "Checks whether m is a bar check."
+       (eq? (ly:music-property m 'name) 'BarCheck))
+     (define (music-origin music)
+       "Recursively search an origin location stored in music."
+       (cond ((null? music) #f)
+	     ((not (null? (ly:music-property music 'origin)))
+	      (ly:music-property music 'origin))
+	     (else (or (music-origin (ly:music-property music 'element))
+		       (let ((origins (remove not (map music-origin
+						       (ly:music-property music 'elements)))))
+			 (and (not (null? origins)) (car origins)))))))
+     ;;
+     ;; first, split the music and fill in voices
+     (map-in-order (lambda (m)
+		     (push-music m)
+		     (if (bar-check? m) (change-voice)))
+		   (ly:music-property music 'elements))
+     (if (not (null? current-sequence)) (change-voice))
+     ;; un-circularize `voices' and reorder the voices
+     (set! voices (map-in-order (lambda (dummy seqs)
+				  (reverse! seqs))
+				voice-ids voices))
+     ;;
+     ;; set origin location of each sequence in each voice
+     ;; for better type error tracking
+     (for-each (lambda (voice)
+		 (for-each (lambda (seq)
+			     (set! (ly:music-property seq 'origin)
+				   (or (music-origin seq) location)))
+			   voice))
+	       voices)
+     ;;
+     ;; check sequence length
+     (apply for-each (lambda* (#:rest seqs)
+			      (let ((moment-reference (ly:music-length (car seqs))))
+				(for-each (lambda (seq moment)
+					    (if (not (equal? moment moment-reference))
+						(ly:music-message seq
+								  "Bars in parallel music don't have the same length")))
+					  seqs (map-in-order ly:music-length seqs))))
+	    voices)
+     ;;
+     ;; bind voice identifiers to the voices
+     (map (lambda (voice-id voice)
+	    (ly:parser-define! parser voice-id
+			       (make-music 'SequentialMusic
+					   'origin location
+					   'elements voice)))
+	  voice-ids voices))
+   ;; Return an empty sequence.  This function is actually a "void" function.
+   (make-music 'SequentialMusic 'void #t))
 
 parenthesize =
 #(define-music-function (parser loc arg) (ly:music?)
    (_i "Tag @var{arg} to be parenthesized.")
 
    (if (memq 'event-chord (ly:music-property arg 'types))
-     ; arg is an EventChord -> set the parenthesize property on all child notes and rests
-     (map
-       (lambda (ev)
-         (if (or (memq 'note-event (ly:music-property ev 'types))
-                 (memq 'rest-event (ly:music-property ev 'types)))
-           (set! (ly:music-property ev 'parenthesize) #t)))
-       (ly:music-property arg 'elements))
-     ; No chord, simply set property for this expression:
-     (set! (ly:music-property arg 'parenthesize) #t))
+       ;; arg is an EventChord -> set the parenthesize property
+       ;; on all child notes and rests
+       (map
+	(lambda (ev)
+	  (if (or (memq 'note-event (ly:music-property ev 'types))
+		  (memq 'rest-event (ly:music-property ev 'types)))
+	      (set! (ly:music-property ev 'parenthesize) #t)))
+	(ly:music-property arg 'elements))
+       ;; No chord, simply set property for this expression:
+       (set! (ly:music-property arg 'parenthesize) #t))
    arg)
 
+partcombine =
+#(define-music-function (parser location part1 part2) (ly:music? ly:music?)
+   (_i "Take the music in @var{part1} and @var{part2} and typeset so
+that they share a staff.")
+   (make-part-combine-music parser
+                            (list part1 part2)))
+
+partcombineForce =
+#(define-music-function (location parser type once) (symbol-or-boolean? boolean?)
+   (_i "Override the part-combiner.")
+   (make-music 'EventChord
+	       'elements (list (make-music 'PartCombineForceEvent
+					   'forced-type type
+					   'once once))))
+partcombineApart = \partcombineForce #'apart ##f
+partcombineApartOnce = \partcombineForce #'apart ##t
+partcombineChords = \partcombineForce #'chords ##f
+partcombineChordsOnce = \partcombineForce #'chords ##t
+partcombineUnisono = \partcombineForce #'unisono ##f
+partcombineUnisonoOnce = \partcombineForce #'unisono ##t
+partcombineSoloI = \partcombineForce #'solo1 ##f
+partcombineSoloIOnce = \partcombineForce #'solo1 ##t
+partcombineSoloII = \partcombineForce #'solo2 ##f
+partcombineSoloIIOnce = \partcombineForce #'solo2 ##t
+partcombineAutomatic = \partcombineForce ##f ##f
+partcombineAutomaticOnce = \partcombineForce ##f ##t
 
-quoteDuring = #
-(define-music-function
-  (parser location what main-music)
-  (string? ly:music?)
-  (make-music 'QuoteMusic
-	      'element main-music
-	      'quoted-music-name what
-	      'origin location))
 
+pitchedTrill =
+#(define-music-function
+   (parser location main-note secondary-note)
+   (ly:music? ly:music?)
+   (_i "Print a trill with @var{main-note} as the main note of the trill and
+print @var{secondary-note} as a stemless note head in parentheses.")
+   (let* ((get-notes (lambda (ev-chord)
+                       (filter
+                        (lambda (m) (eq? 'NoteEvent (ly:music-property m 'name)))
+                        (ly:music-property ev-chord 'elements))))
+          (sec-note-events (get-notes secondary-note))
+          (trill-events (filter (lambda (m) (music-has-type m 'trill-span-event))
+                                (ly:music-property main-note 'elements))))
 
+     (if (pair? sec-note-events)
+         (begin
+           (let* ((trill-pitch (ly:music-property (car sec-note-events) 'pitch))
+                  (forced (ly:music-property (car sec-note-events) 'force-accidental)))
+
+             (if (ly:pitch? trill-pitch)
+                 (for-each (lambda (m)
+                             (ly:music-set-property! m 'pitch trill-pitch)) trill-events)
+                 (begin
+                   (ly:warning (_ "Second argument of \\pitchedTrill should be single note: "))
+                   (display sec-note-events)))
+
+             (if (eq? forced #t)
+                 (for-each (lambda (m)
+                             (ly:music-set-property! m 'force-accidental forced))
+                           trill-events)))))
+     main-note))
 
-resetRelativeOctave  =
+quoteDuring =
+#(define-music-function (parser location what main-music) (string? ly:music?)
+   (_i "Indicate a section of music to be quoted.  @var{what} indicates the name
+of the quoted voice, as specified in an @code{\\addQuote} command.
+@var{main-music} is used to indicate the length of music to be quoted;
+usually contains spacers or multi-measure rests.")
+   (make-music 'QuoteMusic
+               'element main-music
+               'quoted-music-name what))
+
+removeWithTag =
+#(define-music-function (parser location tag music) (symbol? ly:music?)
+   (_i "Remove elements of @var{music} that are tagged with @var{tag}.")
+   (music-filter
+    (lambda (m)
+      (let* ((tags (ly:music-property m 'tags))
+	     (res (memq tag tags)))
+	(not res)))
+    music))
+
+resetRelativeOctave =
+#(define-music-function (parser location reference-note) (ly:music?)
+   (_i "Set the octave inside a \\relative section.")
+
+   (let* ((notes (ly:music-property reference-note 'elements))
+	  (pitch (ly:music-property (car notes) 'pitch)))
+
+     (set! (ly:music-property reference-note 'elements) '())
+     (set! (ly:music-property reference-note 'to-relative-callback)
+	   (lambda (music last-pitch)
+	     pitch))
+
+     reference-note))
+
+revertTimeSignatureSettings =
 #(define-music-function
-    (parser location reference-note)
-    (ly:music?)
-    (_i "Set the octave inside a \\relative section.")
-
-   (let*
-    ((notes (ly:music-property reference-note 'elements))
-     (pitch (ly:music-property (car notes) 'pitch)))
+   (parser location time-signature)
+   (pair?)
 
-    (set! (ly:music-property reference-note 'elements) '())
-    (set! (ly:music-property reference-note
-       'to-relative-callback)
-       (lambda (music last-pitch)
-        pitch))
+   (_i "Revert @code{timeSignatureSettings}
+for time signatures of @var{time-signature}.")
+   (revert-time-signature-setting time-signature))
 
-    reference-note))
+rightHandFinger =
+#(define-music-function (parser location finger) (number-or-string?)
+   (_i "Apply @var{finger} as a fingering indication.")
 
+   (apply make-music
+	  (append
+	   (list
+	    'StrokeFingerEvent
+	    'origin location)
+	   (if	(string? finger)
+		(list 'text finger)
+		(list 'digit finger)))))
 
-scaleDurations =
-#(define-music-function
-		  (parser location fraction music) (number-pair? ly:music?)
-		  (ly:music-compress music (ly:make-moment (car fraction) (cdr fraction))))
 
 
+scaleDurations =
+#(define-music-function (parser location fraction music)
+   (number-pair? ly:music?)
+   (_i "Multiply the duration of events in @var{music} by @var{fraction}.")
+   (ly:music-compress music
+		      (ly:make-moment (car fraction) (cdr fraction))))
 
 shiftDurations =
-#(define-music-function (parser location dur dots arg) (integer? integer? ly:music?)
-   (_i "")
-   
+#(define-music-function (parser location dur dots arg)
+   (integer? integer? ly:music?)
+   (_i "Scale @var{arg} up by a factor of @var{2^dur*(2-(1/2)^dots)}.")
+
    (music-map
     (lambda (x)
       (shift-one-duration-log x dur dots)) arg))
@@ -665,40 +825,28 @@ spacingTweaks =
    (_i "Set the system stretch, by reading the 'system-stretch property of
 the `parameters' assoc list.")
    #{
-      \overrideProperty #"Score.NonMusicalPaperColumn"
-        #'line-break-system-details
-        #$(list (cons 'alignment-extra-space (cdr (assoc 'system-stretch parameters)))
-		(cons 'system-Y-extent (cdr (assoc 'system-Y-extent parameters))))
+     \overrideProperty #"Score.NonMusicalPaperColumn"
+     #'line-break-system-details
+     #$(list (cons 'alignment-extra-space (cdr (assoc 'system-stretch parameters)))
+	     (cons 'system-Y-extent (cdr (assoc 'system-Y-extent parameters))))
    #})
 
+styledNoteHeads =
+#(define-music-function (parser location style heads music)
+   (symbol? list-or-symbol? ly:music?)
+   (_i "Set @var{heads} in @var{music} to @var{style}.")
+   (style-note-heads heads style music))
 
-rightHandFinger =
-#(define-music-function (parser location finger) (number-or-string?)
-   (_i "Define a StrokeFingerEvent")
-   
-   (apply make-music
-	  (append
-	   (list 
-	    'StrokeFingerEvent
-	    'origin location)
-	   (if  (string? finger)
-		(list 'text finger)
-		(list 'digit finger)))))
 
-scoreTweak =
-#(define-music-function (parser location name) (string?)
-   (_i "Include the score tweak, if exists.")
-   (if (and page-layout-parser (not (ly:get-option 'dump-tweaks)))
-       (let ((tweak-music (ly:parser-lookup page-layout-parser
-                                            (string->symbol name))))
-         (if (ly:music? tweak-music)
-             tweak-music
-             (make-music 'SequentialMusic)))
-       (make-music 'SequentialMusic)))
 
+tabChordRepetition =
+#(define-music-function (parser location) ()
+   (_i "Include the string information in a chord repetition.")
+   (ly:parser-set-repetition-function parser tab-repeat-chord)
+   (make-music 'SequentialMusic 'void #t))
 
-tag = #(define-music-function (parser location tag arg)
-   (symbol? ly:music?)
+tag =
+#(define-music-function (parser location tag arg) (symbol? ly:music?)
 
    (_i "Add @var{tag} to the @code{tags} property of @var{arg}.")
 
@@ -708,29 +856,24 @@ tag = #(define-music-function (parser location tag arg)
 	  (ly:music-property arg 'tags)))
    arg)
 
-
-
 transposedCueDuring =
 #(define-music-function
-  (parser location what dir pitch-note main-music)
-  (string? ly:dir? ly:music? ly:music?)
+   (parser location what dir pitch-note main-music)
+   (string? ly:dir? ly:music? ly:music?)
 
-  (_i "Insert notes from the part @var{what} into a voice called @code{cue},
+   (_i "Insert notes from the part @var{what} into a voice called @code{cue},
 using the transposition defined by @var{pitch-note}.  This happens
-simultaneously with @var{main-music}, which is usually a rest.  The
+simultaneously with @var{main-music}, which is usually a rest.	The
 argument @var{dir} determines whether the cue notes should be notated
 as a first or second voice.")
 
-  (make-music 'QuoteMusic
-	      'element main-music
-	      'quoted-context-type 'Voice
-	      'quoted-context-id "cue"
-	      'quoted-music-name what
-	      'quoted-voice-direction dir
-	      'quoted-transposition (pitch-of-note pitch-note)
-	      'origin location))
-
-
+   (make-music 'QuoteMusic
+	       'element main-music
+	       'quoted-context-type 'Voice
+	       'quoted-context-id "cue"
+	       'quoted-music-name what
+	       'quoted-voice-direction dir
+	       'quoted-transposition (pitch-of-note pitch-note)))
 
 transposition =
 #(define-music-function (parser location pitch-note) (ly:music?)
@@ -739,29 +882,37 @@ transposition =
    (context-spec-music
     (make-property-set 'instrumentTransposition
 		       (ly:pitch-negate (pitch-of-note pitch-note)))
-        'Staff))
+    'Staff))
 
-tweak = #(define-music-function (parser location sym val arg)
-	   (symbol? scheme? ly:music?)
+tweak =
+#(define-music-function (parser location sym val arg)
+   (symbol? scheme? ly:music?)
+   (_i "Add @code{sym . val} to the @code{tweaks} property of @var{arg}.")
 
-	   (_i "Add @code{sym . val} to the @code{tweaks} property of @var{arg}.")
-	   
-	   (set!
-	    (ly:music-property arg 'tweaks)
-	    (acons sym val
-		   (ly:music-property arg 'tweaks)))
-	   arg)
+   (if (equal? (object-property sym 'backend-type?) #f)
+       (begin
+	 (ly:warning (_ "cannot find property type-check for ~a") sym)
+	 (ly:warning (_ "doing assignment anyway"))))
+   (set!
+    (ly:music-property arg 'tweaks)
+    (acons sym val
+	   (ly:music-property arg 'tweaks)))
+   arg)
 
 
 
 unfoldRepeats =
 #(define-music-function (parser location music) (ly:music?)
-		  (unfold-repeats music))
+   (_i "Force any @code{\\repeat volta}, @code{\\repeat tremolo} or
+@code{\\repeat percent} commands in @var{music} to be interpreted
+as @code{\\repeat unfold}.")
+   (unfold-repeats music))
 
 
 
 withMusicProperty =
-#(define-music-function (parser location sym val music) (symbol? scheme? ly:music?)
+#(define-music-function (parser location sym val music)
+   (symbol? scheme? ly:music?)
    (_i "Set @var{sym} to @var{val} in @var{music}.")
 
    (set! (ly:music-property music sym) val)