X-Git-Url: https://git.donarmstrong.com/?a=blobdiff_plain;f=scm%2Fmusic-functions.scm;h=928eaf71692a5cf06c4f58fd480e3f7c290fab22;hb=bf7a2e96ce259693a62a24fa08655bfa423f22f7;hp=8bffc5e52f35dcb6eb870cad5ee23556a2f56ae8;hpb=9f8e04c4008b5f50ee2f771568d18df50764e0f5;p=lilypond.git

diff --git a/scm/music-functions.scm b/scm/music-functions.scm
index 8bffc5e52f..928eaf7169 100644
--- a/scm/music-functions.scm
+++ b/scm/music-functions.scm
@@ -1,559 +1,1002 @@
-
-;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;;;; music-functions.scm --
+;;;;
+;;;;  source file of the GNU LilyPond music typesetter
+;;;; 
+;;;; (c) 1998--2006 Jan Nieuwenhuizen <janneke@gnu.org>
+;;;;                 Han-Wen Nienhuys <hanwen@xs4all.nl>
+
+;; (use-modules (ice-9 optargs)) 
+
+;;; ly:music-property with setter
+;;; (ly:music-property my-music 'elements)
+;;;   ==> the 'elements property
+;;; (set! (ly:music-property my-music 'elements) value)
+;;;   ==> set the 'elements property and return it
+(define-public ly:music-property
+  (make-procedure-with-setter ly:music-property
+			      ly:music-set-property!))
+
+(define-safe-public (music-is-of-type? mus type)
+  "Does @code{mus} belong to the music class @code{type}?"
+  (memq type (ly:music-property mus 'types)))
+
+;; TODO move this
+(define-public ly:grob-property
+  (make-procedure-with-setter ly:grob-property
+			      ly:grob-set-property!))
+
+(define-public ly:prob-property
+  (make-procedure-with-setter ly:prob-property
+			      ly:prob-set-property!))
 
 (define-public (music-map function music)
-  "Apply @var{function} to @var{music} and all of the music it contains. "
-  (let* ((es (ly:get-mus-property music 'elements))
-         (e (ly:get-mus-property music 'element))
-	 )
-
-    (ly:set-mus-property! music 'elements 
-	(map (lambda (y) (music-map  function y)) es))
-	(if (ly:music? e)
-	    (ly:set-mus-property! music 'element (music-map function  e)))
-	(function music)
-	))
+  "Apply @var{function} to @var{music} and all of the music it contains.
 
-(define-public (display-music music)
-  "Display music, not done with music-map for clarity of presentation."
-  (display music)
-  (display ": { ")
+First it recurses over the children, then the function is applied to MUSIC.
+"
+  (let ((es (ly:music-property music 'elements))
+	(e (ly:music-property music 'element)))
+    (set! (ly:music-property music 'elements) 
+	  (map (lambda (y) (music-map function y)) es))
+    (if (ly:music? e)
+	(set! (ly:music-property music 'element)
+	      (music-map function  e)))
+    (function music)))
+
+(define-public (music-filter pred? music)
+  "Filter out music expressions that do not satisfy PRED."
   
-  (let* ((es (ly:get-mus-property music 'elements))
-         (e (ly:get-mus-property music 'element))
-	 )
+  (define (inner-music-filter pred? music)
+    "Recursive function."
+    (let* ((es (ly:music-property music 'elements))
+	   (e (ly:music-property music 'element))
+	   (as (ly:music-property music 'articulations))
+	   (filtered-as (filter ly:music? (map (lambda (y) (inner-music-filter pred? y)) as)))
+	   (filtered-e (if (ly:music? e)
+			   (inner-music-filter pred? e)
+			   e))
+	   (filtered-es (filter ly:music? (map (lambda (y) (inner-music-filter pred? y)) es))))
+      (set! (ly:music-property music 'element) filtered-e)
+      (set! (ly:music-property music 'elements) filtered-es)
+      (set! (ly:music-property music 'articulations) filtered-as)
+      ;; if filtering emptied the expression, we remove it completely.
+      (if (or (not (pred? music))
+	      (and (eq? filtered-es '()) (not (ly:music? e))
+		   (or (not (eq? es '()))
+		       (ly:music? e))))
+	  (set! music '()))
+      music))
+
+  (set! music (inner-music-filter pred? music))
+  (if (ly:music? music)
+      music
+      (make-music 'Music)))	  ;must return music.
 
-    (display (ly:get-mutable-properties music))
+(define-public (display-music music)
+  "Display music, not done with music-map for clarity of presentation."
 
-    (if (pair?  es)
+  (display music)
+  (display ": { ")  
+  (let ((es (ly:music-property music 'elements))
+	(e (ly:music-property music 'element)))
+    (display (ly:music-mutable-properties music))
+    (if (pair? es)
 	(begin (display "\nElements: {\n")
 	       (map display-music es)
-	       (display "}\n")
-	))
-    
-    
+	       (display "}\n")))
     (if (ly:music? e)
 	(begin
 	  (display "\nChild:")
-	  (display-music e)
-	  )
-	)
-    )
+	  (display-music e))))
   (display " }\n")
-  music
-  )
-
+  music)
 
+;;;
+;;; A scheme music pretty printer
+;;;
+(define (markup-expression->make-markup markup-expression)
+  "Transform `markup-expression' into an equivalent, hopefuly readable, scheme expression.
+For instance, 
+  \\markup \\bold \\italic hello
+==>
+  (markup #:line (#:bold (#:italic (#:simple \"hello\"))))"
+  (define (proc->command-keyword proc)
+    "Return a keyword, eg. `#:bold', from the `proc' function, eg. #<procedure bold-markup (layout props arg)>"
+    (let ((cmd-markup (symbol->string (procedure-name proc))))
+      (symbol->keyword (string->symbol (substring cmd-markup 0 (- (string-length cmd-markup)
+								  (string-length "-markup")))))))
+  (define (transform-arg arg)
+    (cond ((and (pair? arg) (markup? (car arg))) ;; a markup list
+	   (apply append (map inner-markup->make-markup arg)))
+	  ((and (not (string? arg)) (markup? arg)) ;; a markup
+	   (inner-markup->make-markup arg))
+	  (else					 ;; scheme arg
+	   arg)))
+  (define (inner-markup->make-markup mrkup)
+    (if (string? mrkup)
+	`(#:simple ,mrkup)
+	(let ((cmd (proc->command-keyword (car mrkup)))
+	      (args (map transform-arg (cdr mrkup))))
+	  `(,cmd ,@args))))
+  ;; body:
+  (if (string? markup-expression)
+      markup-expression
+      `(markup ,@(inner-markup->make-markup markup-expression))))
+
+(define-public (music->make-music obj)
+  "Generate a expression that, once evaluated, may return an object equivalent to `obj',
+that is, for a music expression, a (make-music ...) form."
+  (cond (;; markup expression
+	 (markup? obj)
+	 (markup-expression->make-markup obj))
+	(;; music expression
+	 (ly:music? obj)
+	 `(make-music 
+	   ',(ly:music-property obj 'name)
+	   ,@(apply append (map (lambda (prop)
+                                  `(',(car prop)
+				    ,(music->make-music (cdr prop))))
+                                (remove (lambda (prop)
+                                          (eqv? (car prop) 'origin))
+                                        (ly:music-mutable-properties obj))))))
+	(;; moment
+	 (ly:moment? obj)
+	 `(ly:make-moment ,(ly:moment-main-numerator obj)
+			  ,(ly:moment-main-denominator obj)
+			  ,(ly:moment-grace-numerator obj)
+			  ,(ly:moment-grace-denominator obj)))
+	(;; note duration
+	 (ly:duration? obj)
+	 `(ly:make-duration ,(ly:duration-log obj)
+			    ,(ly:duration-dot-count obj)
+			    ,(car (ly:duration-factor obj))
+			    ,(cdr (ly:duration-factor obj))))
+	(;; note pitch
+	 (ly:pitch? obj)
+	 `(ly:make-pitch ,(ly:pitch-octave obj)
+			 ,(ly:pitch-notename obj)
+			 ,(ly:pitch-alteration obj)))
+	(;; scheme procedure
+	 (procedure? obj)
+	 (or (procedure-name obj) obj))
+	(;; a symbol (avoid having an unquoted symbol)
+	 (symbol? obj)
+	 `',obj)
+	(;; an empty list (avoid having an unquoted empty list)
+	 (null? obj)
+	 `'())
+	(;; a proper list
+	 (list? obj)
+	 `(list ,@(map music->make-music obj)))
+	(;; a pair
+	 (pair? obj)
+	 `(cons ,(music->make-music (car obj)) 
+		,(music->make-music (cdr obj))))
+	(else
+	 obj)))
+
+(use-modules (ice-9 pretty-print))
+(define*-public (display-scheme-music obj #:optional (port (current-output-port)))
+  "Displays `obj', typically a music expression, in a friendly fashion,
+which often can be read back in order to generate an equivalent expression.
+
+Returns `obj'.
+"
+  (pretty-print (music->make-music obj) port)
+  (newline)
+  obj)
 
+;;;
+;;; Scheme music expression --> Lily-syntax-using string translator
+;;;
+(use-modules (srfi srfi-39)
+             (scm display-lily))
+
+(define*-public (display-lily-music expr parser #:key force-duration)
+  "Display the music expression using LilyPond syntax"
+  (memoize-clef-names supported-clefs)
+  (parameterize ((*indent* 0)
+		 (*previous-duration* (ly:make-duration 2))
+		 (*force-duration* force-duration))
+    (display (music->lily-string expr parser))
+    (newline)))
 
-  
 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
 
-(define (shift-one-duration-log music shift dot)
-  "  add SHIFT to ly:duration-log and optionally 
+(define-public (shift-one-duration-log music shift dot)
+  "  add SHIFT to duration-log of 'duration in music and optionally 
   a dot to any note encountered. This scales the music up by a factor 
   2^shift * (2 - (1/2)^dot)"
-
-  (let*
-      (
-       (d (ly:get-mus-property music 'duration))
-       )
+  (let ((d (ly:music-property music 'duration)))
     (if (ly:duration? d)
-	(let* (
-	       (cp (ly:duration-factor d))
+	(let* ((cp (ly:duration-factor d))
 	       (nd (ly:make-duration (+ shift (ly:duration-log d))
 				     (+ dot (ly:duration-dot-count d))
 				     (car cp)
-				     (cdr cp)))
-	       
-	       )
-	  (ly:set-mus-property! music 'duration nd)
-	  ))
+				     (cdr cp))))
+	  (set! (ly:music-property music 'duration) nd)))
     music))
 
-
-
 (define-public (shift-duration-log music shift dot)
   (music-map (lambda (x) (shift-one-duration-log x shift dot))
 	     music))
-  
 
+(define-public (make-repeat name times main alts)
+  "create a repeat music expression, with all properties initialized properly"
+  (let ((talts (if (< times (length alts))
+		   (begin
+		     (ly:warning (_ "More alternatives than repeats.  Junking excess alternatives"))
+		     (take alts times))
+		   alts))
+	(r (make-repeated-music name)))
+    (set! (ly:music-property r 'element) main)
+    (set! (ly:music-property r 'repeat-count) (max times 1))
+    (set! (ly:music-property r 'elements) talts)
+    (if (equal? name "tremolo")
+	(let* ((dot? (zero? (modulo times 3)))
+	       (dots (if dot? 1 0))
+	       (mult (if dot?
+			 (quotient (* times 2) 3)
+			 times))
+	       (shift (- (ly:intlog2 mult))))
+	  
+	  (if (memq 'sequential-music (ly:music-property main 'types))
+	      ;; \repeat "tremolo" { c4 d4 }
+	      (let ((children (length (ly:music-property main 'elements))))
+
+		;; fixme: should be more generic.
+		(if (and (not (= children 2))
+			 (not (= children 1)))
+		    (ly:warning (_ "expecting 2 elements for chord tremolo, found ~a") children))
+		(ly:music-compress r (ly:make-moment 1 children))
+		(shift-duration-log r
+				    (if (= children 2)  (1- shift) shift)
+				    dots))
+	      ;; \repeat "tremolo" c4
+	      (shift-duration-log r shift dots)))
+	r)))
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; clusters.
 
+(define-public (note-to-cluster music)
+  "Replace NoteEvents by ClusterNoteEvents."
+  (if (eq? (ly:music-property music 'name) 'NoteEvent)
+      (make-music 'ClusterNoteEvent
+		  'pitch (ly:music-property music 'pitch)
+		  'duration (ly:music-property music 'duration))
+      music))
+
+(define-public (notes-to-clusters music)
+  (music-map note-to-cluster music))
 
 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
 ;; repeats.
 
 (define-public (unfold-repeats music)
-"
-This function replaces all repeats  with unfold repeats. It was 
-written by Rune Zedeler. "
-  (let* ((es (ly:get-mus-property music 'elements))
-         (e (ly:get-mus-property music 'element))
-         (n  (ly:music-name music)))
- 
-    (if (equal? n "Repeated_music")
-        (begin
-	  (if (equal?
-	       (ly:get-mus-property music 'iterator-ctor)
-	       Chord_tremolo_iterator::constructor)
-	      (shift-duration-log music  (ly:intlog2 (ly:get-mus-property music 'repeat-count)) 0)
-	      )
-          (ly:set-mus-property!
-           music 'length Repeated_music::unfolded_music_length)
-	  (ly:set-mus-property!
-	   music 'start-moment-function Repeated_music::first_start)
-          (ly:set-mus-property!
-           music 'iterator-ctor Unfolded_repeat_iterator::constructor)))
+  "
+This function replaces all repeats  with unfold repeats. "
 
+  (let ((es (ly:music-property music 'elements))
+	(e  (ly:music-property music 'element))
+	)
+    (if (memq 'repeated-music (ly:music-property music 'types))
+	(let*
+	    ((props (ly:music-mutable-properties music))
+	     (old-name (ly:music-property music 'name))
+	     (flattened  (flatten-alist props)))
+
+	  (set! music (apply make-music (cons 'UnfoldedRepeatedMusic
+					      flattened)))
+
+	  (if (equal? old-name 'TremoloRepeatedMusic)
+	      (let* ((seq-arg? (memq 'sequential-music
+				     (ly:music-property e 'types)))
+		     (count  (ly:music-property music 'repeat-count))
+		     (dot-shift (if (= 0 (remainder count 3))
+				    -1 0)))
+
+		(if (= 0 -1)
+		    (set! count (* 2 (quotient count 3))))
+		
+		(shift-duration-log music (+ (if seq-arg? 1 0)
+					     (ly:intlog2 count)) dot-shift)
+		
+		(if seq-arg?
+		    (ly:music-compress e (ly:make-moment (length (ly:music-property
+								  e 'elements)) 1)))))))
+	  
+    
     (if (pair? es)
-        (ly:set-mus-property!
-         music 'elements
-         (map unfold-repeats es)))
-
+	(set! (ly:music-property music 'elements)
+	      (map unfold-repeats es)))
     (if (ly:music? e)
-        (ly:set-mus-property!
-         music 'element
-         (unfold-repeats e)))
-
+	(set! (ly:music-property music 'element)
+	      (unfold-repeats e)))
     music))
 
-
 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
 ;; property setting music objs.
 
 (define-public (make-grob-property-set grob gprop val)
-
   "Make a Music expression that sets GPROP to VAL in GROB. Does a pop first,
 i.e.  this is not an override"
-  
-   (let* ((m (make-music-by-name  'OverrideProperty)))
-     (ly:set-mus-property! m 'symbol grob)
-     (ly:set-mus-property! m 'grob-property gprop)
-     (ly:set-mus-property! m 'grob-value val)
-     (ly:set-mus-property! m 'pop-first #t)
-		
-     m
-   
-   ))
+  (make-music 'OverrideProperty
+	      'symbol grob
+	      'grob-property gprop
+	      'grob-value val
+	      'pop-first #t))
 
+(define-public (make-grob-property-override grob gprop val)
+  "Make a Music expression that sets GPROP to VAL in GROB. Does a pop first,
+i.e.  this is not an override"
+  (make-music 'OverrideProperty
+	      'symbol grob
+	      'grob-property gprop
+	      'grob-value val))
 
 (define-public (make-grob-property-revert grob gprop)
   "Revert the grob property GPROP for GROB."
-   (let* ((m (make-music-by-name  'OverrideProperty)))
-     (ly:set-mus-property! m 'symbol grob)
-     (ly:set-mus-property! m 'grob-property gprop)
-		
-     m
-   
-   ))
+  (make-music 'RevertProperty
+	      'symbol grob
+	      'grob-property gprop))
 
+(define direction-polyphonic-grobs
+  '(Stem Tie Rest Slur PhrasingSlur Script TextScript Dots DotColumn Fingering))
 
-(define-public (make-voice-props-set n)
+(define-safe-public (make-voice-props-set n)
   (make-sequential-music
    (append
-      (map (lambda (x) (make-grob-property-set x 'direction
-					       (if (odd? n) -1 1)))
-	   '(Tie Slur Stem Dots))
-      (list
-       (make-grob-property-set 'NoteColumn 'horizontal-shift (quotient n 2))
-       (make-grob-property-set 'MultiMeasureRest 'staff-position
-			       (if (odd? n) -4 4)
-			       )
-       
-       )
-   )
-  ))
-
+    (map (lambda (x) (make-grob-property-set x 'direction
+					     (if (odd? n) -1 1)))
+	 direction-polyphonic-grobs)
+    (list
+     (make-property-set 'graceSettings
+			;; TODO: take this from voicedGraceSettings or similar.
+			'((Voice Stem font-size -3)
+			  (Voice NoteHead font-size -3)
+			  (Voice Dots font-size -3)
+			  (Voice Stem length-fraction 0.8)
+			  (Voice Stem no-stem-extend #t)
+			  (Voice Beam thickness 0.384)
+			  (Voice Beam length-fraction 0.8)
+			  (Voice Accidental font-size -4)))
+    
+     (make-grob-property-set 'NoteColumn 'horizontal-shift (quotient n 2))
+     (make-grob-property-set 'MultiMeasureRest 'staff-position (if (odd? n) -4 4)))))) 
 
-(define-public (make-voice-props-revert)
+(define-safe-public (make-voice-props-revert)
   (make-sequential-music
-   (list
-      (make-grob-property-revert 'Tie 'direction)
-      (make-grob-property-revert 'Dots 'direction)
-      (make-grob-property-revert 'Stem 'direction)
-      (make-grob-property-revert 'Slur 'direction)	    
-      (make-grob-property-revert 'NoteColumn 'horizontal-shift)
-   ))
-  )
-
-
-(define-public (context-spec-music m context . rest)
-  "Add \context CONTEXT = foo to M. "
-  
-  (let* ((cm (make-music-by-name 'ContextSpeccedMusic)))
-    (ly:set-mus-property! cm 'element m)
-    (ly:set-mus-property! cm 'context-type context)
-    (if (and  (pair? rest) (string? (car rest)))
-	(ly:set-mus-property! cm 'context-id (car rest))
-    )
-    cm
-  ))
+   (append
+    (map (lambda (x) (make-grob-property-revert x 'direction))
+	 direction-polyphonic-grobs)
+    (list (make-property-unset 'graceSettings)
+	  (make-grob-property-revert 'NoteColumn 'horizontal-shift)
+	  (make-grob-property-revert 'MultiMeasureRest 'staff-position)))))
+
+
+(define-safe-public (context-spec-music m context #:optional id)
+  "Add \\context CONTEXT = ID to M. "
+  (let ((cm (make-music 'ContextSpeccedMusic
+			'element m
+			'context-type context)))
+    (if (string? id)
+	(set! (ly:music-property cm 'context-id) id))
+    cm))
+
+(define-public (descend-to-context m context)
+  "Like context-spec-music, but only descending. "
+  (let ((cm (context-spec-music m context)))
+    (ly:music-set-property! cm 'descend-only #t)
+    cm))
+
+(define-public (make-non-relative-music mus)
+  (make-music 'UnrelativableMusic
+	      'element mus))
 
 (define-public (make-apply-context func)
-  (let*
-      (
-       (m (make-music-by-name 'ApplyContext))
-       )
-
-    (ly:set-mus-property! m 'procedure func)
-    m
-  ))
+  (make-music 'ApplyContext
+	      'procedure func))
 
 (define-public (make-sequential-music elts)
-  (let*  ((m (make-music-by-name 'SequentialMusic)))
-    (ly:set-mus-property! m 'elements elts)
-    m
-  ))
+  (make-music 'SequentialMusic
+	      'elements elts))
 
 (define-public (make-simultaneous-music elts)
-  (let*  ((m (make-music-by-name 'SimultaneousMusic)))
-    (ly:set-mus-property! m 'elements elts)
-    m
-    ))
+  (make-music 'SimultaneousMusic
+	      'elements elts))
+
+(define-safe-public (make-event-chord elts)
+  (make-music 'EventChord
+	      'elements elts))
 
-(define-public (make-event-chord elts)
-  (let*  ((m (make-music-by-name 'EventChord)))
-    (ly:set-mus-property! m 'elements elts)
-    m
-    ))
+(define-public (make-skip-music dur)
+  (make-music 'SkipMusic
+	      'duration dur))
+
+(define-public (make-grace-music music)
+  (make-music 'GraceMusic
+	      'element music))
 
 ;;;;;;;;;;;;;;;;
+
 ;; mmrest
 (define-public (make-multi-measure-rest duration location)
-  (let*
-      (
-       (start (make-music-by-name 'MultiMeasureRestEvent))
-       (stop  (make-music-by-name 'MultiMeasureRestEvent))
-       (skip ( make-music-by-name 'SkipEvent))
-       (ch (make-music-by-name 'BarCheck))
-       (ch2  (make-music-by-name 'BarCheck))
-       (seq  (make-music-by-name 'MultiMeasureRestMusicGroup))
-       )
-
-    (map (lambda (x) (ly:set-mus-property! x 'origin location))
-	 (list start stop skip ch ch2 seq))
-    (ly:set-mus-property! start 'span-direction START)
-    (ly:set-mus-property! stop 'span-direction STOP)    
-    (ly:set-mus-property! skip 'duration duration)
-    (ly:set-mus-property! seq 'elements
-     (list
-      ch
-      (make-event-chord (list start))
-      (make-event-chord (list skip))
-      (make-event-chord (list stop))
-      ch2
-      ))
-
-    seq
-    ))
-
-(define-public (glue-mm-rest-texts music)
-  "Check if we have R1*4-\markup { .. }, and if applicable convert to
-a property set for MultiMeasureRestNumber."
-  
-  (define (script-to-mmrest-text script-music)
-    "Extract 'direction and 'text   from SCRIPT-MUSIC, and transform into property sets."
-    
-    (let*
-	(
-	 (text (ly:get-mus-property script-music 'text))
-	 (dir (ly:get-mus-property script-music 'direction))
-	 (p (make-music-by-name 'MultiMeasureTextEvent))
-	 )
-
-      (if (ly:dir? dir)
-	  (ly:set-mus-property! p  'direction dir))
-      (ly:set-mus-property! p 'text text)
-      p
-    ))
-  
-  (if (eq? (ly:get-mus-property music 'name)  'MultiMeasureRestMusicGroup)
-      (let*
-	  (
-	   (text? (lambda (x) (memq 'script-event (ly:get-mus-property x 'types))))
-	   (es (ly:get-mus-property  music 'elements))
-	   (texts (map script-to-mmrest-text  (filter text? es)))
-	   (others (remove text? es))
-	   )
-	(if (pair? texts)
-	    (ly:set-mus-property!
-	     music 'elements
-	     (cons (make-event-chord texts) others)
-	    ))
-      ))
-  music
-  )
-
+  (make-music 'MultiMeasureRestMusic
+	      'origin location
+	      'duration duration))
 
 (define-public (make-property-set sym val)
-  (let*
-      (
-       (m (make-music-by-name 'PropertySet))
-       )
-    (ly:set-mus-property! m 'symbol sym)
-    (ly:set-mus-property! m 'value val)
-    m
-  ))
-
+  (make-music 'PropertySet
+	      'symbol sym
+	      'value val))
 
+(define-public (make-property-unset sym)
+  (make-music 'PropertyUnset
+	      'symbol sym))
 
 (define-public (make-ottava-set octavation)
-  (let*
-      (
-       (m (make-music-by-name 'ApplyContext))
-       )
-    
-  
-  (define (ottava-modify context)
-    "Either reset centralCPosition to the stored original,
-or remember old centralCPosition, add OCTAVATION to centralCPosition,
-and set OTTAVATION to `8va', or whatever appropriate."
-    (if (number? (ly:get-context-property  context 'centralCPosition))
-	
-	(if (= octavation 0)
-	    (let*
-		((where (ly:context-property-where-defined context 'centralCPosition))
-		 (oc0 (ly:get-context-property context 'originalCentralCPosition)))
-
-	      (ly:set-context-property context 'centralCPosition oc0)
-	      (ly:unset-context-property where 'originalCentralCPosition)
-	      (ly:unset-context-property where 'ottavation))
-
-	    (let*
-		((where (ly:context-property-where-defined context 'centralCPosition))
-		 (c0 (ly:get-context-property context 'centralCPosition))
-		 (new-c0 (+ c0 (* -7 octavation)))
-		 (string (cdr
-			  (assoc octavation '((2 . "15ma")
-					      (1 . "8va")
-					      (0 . #f)
-					      (-1 . "8va bassa")
-					      (-2 . "15ma bassa"))))))
-
-	      (ly:set-context-property context 'centralCPosition new-c0)
-	      (ly:set-context-property context 'originalCentralCPosition c0)
-	      (ly:set-context-property context 'ottavation string)
-	      
-	      ))))
-
-  (ly:set-mus-property! m 'procedure  ottava-modify)
-  (context-spec-music m "Staff")
-  ))
+  (let ((m (make-music 'ApplyContext)))
+    (define (ottava-modify context)
+      "Either reset middleCPosition to the stored original, or remember
+old middleCPosition, add OCTAVATION to middleCPosition, and set
+OTTAVATION to `8va', or whatever appropriate."	    
+      (if (number? (ly:context-property	 context 'middleCPosition))
+	  (begin
+	    (if (number? (ly:context-property context 'originalMiddleCPosition))
+		(let ((where (ly:context-property-where-defined context 'middleCPosition)))
+		  
+		  (ly:context-set-property! context 'middleCPosition
+					    (ly:context-property context 'originalMiddleCPosition))
+		  (ly:context-unset-property where 'originalMiddleCPosition)
+		  (ly:context-unset-property where 'ottavation)))
+ot	    
+	    (let* ((where (ly:context-property-where-defined context 'middleCPosition))
+		   (c0 (ly:context-property context 'middleCPosition))
+		   (new-c0 (+ c0 (* -7 octavation)))
+		   (string (cdr (assoc octavation '((2 . "15ma")
+						    (1 . "8va")
+						    (0 . #f)
+						    (-1 . "8vb")
+						    (-2 . "15mb"))))))
+	      (ly:context-set-property! context 'middleCPosition new-c0)
+	      (ly:context-set-property! context 'originalMiddleCPosition c0)
+	      (ly:context-set-property! context 'ottavation string)))))
+    (set! (ly:music-property m 'procedure) ottava-modify)
+    (context-spec-music m 'Staff)))
 
 (define-public (set-octavation ottavation)
   (ly:export (make-ottava-set ottavation)))
 
 (define-public (make-time-signature-set num den . rest)
-  " Set properties for time signature NUM/DEN.
-Rest can contain a list of beat groupings 
+  "Set properties for time signature NUM/DEN.  Rest can contain a list
+of beat groupings "
 
-"
+  (define (standard-beat-grouping num den)
+
+    "Some standard subdivisions for time signatures."
+    (let*
+	((key (cons num den))
+	 (entry (assoc key '(((6 . 8) . (3 3))
+			 ((5 . 8) . (3 2))
+			 ((9 . 8) . (3 3 3))
+			 ((12 . 8) . (3 3 3 3))
+			 ((8 . 8) . (3 3 2))
+			 ))))
+
+      (if entry
+	  (cdr entry)
+	  '())))    
   
-  (let*
-      (
-       (set1 (make-property-set 'timeSignatureFraction (cons num den) ))
-       (beat (ly:make-moment 1 den))
-       (len  (ly:make-moment num den))
-       (set2 (make-property-set 'beatLength beat))
-       (set3 (make-property-set 'measureLength len))
-       (set4 (make-property-set 'beatGrouping (if (pair? rest)
-						  (car rest)
-						  '())))
-       (basic  (list set1 set2 set3 set4)))
-
-    (context-spec-music
-     (make-sequential-music basic) "Timing")))
+  (let* ((set1 (make-property-set 'timeSignatureFraction (cons num den)))
+	 (beat (ly:make-moment 1 den))
+	 (len  (ly:make-moment num den))
+	 (set2 (make-property-set 'beatLength beat))
+	 (set3 (make-property-set 'measureLength len))
+	 (set4 (make-property-set 'beatGrouping (if (pair? rest)
+						    (car rest)
+						    (standard-beat-grouping num den))))
+	 (basic	 (list set1 set2 set3 set4)))
+    (descend-to-context
+     (context-spec-music (make-sequential-music basic) 'Timing) 'Score)))
+
+(define-public (make-mark-set label)
+  "Make the music for the \\mark command."  
+  (let* ((set (if (integer? label)
+		  (context-spec-music (make-property-set 'rehearsalMark label)
+				      'Score)
+		  #f))
+	 (ev (make-music 'MarkEvent))
+	 (ch (make-event-chord (list ev))))
+    (if set
+	(make-sequential-music (list set ch))
+	(begin
+	  (set! (ly:music-property ev 'label) label)
+	  ch))))
 
 (define-public (set-time-signature num den . rest)
   (ly:export (apply make-time-signature-set `(,num ,den . ,rest))))
 
-(define-public (make-penalty-music pen)
- (let
-     ((m (make-music-by-name 'BreakEvent)))
-   (ly:set-mus-property! m 'penalty pen)
-   m))
-
-(define-public (make-articulation name)
-  (let* (
-	 (m (make-music-by-name 'ArticulationEvent))
-      )
-      (ly:set-mus-property! m 'articulation-type name)
-      m
-  ))
-
-(define-public (make-span-event type spandir)
-  (let* (
-	 (m (make-music-by-name  type))
-	 )
-    (ly:set-mus-property! m 'span-direction spandir)
-    m
-    ))
+(define-safe-public (make-articulation name)
+  (make-music 'ArticulationEvent
+	      'articulation-type name))
+
+(define-public (make-lyric-event string duration)
+  (make-music 'LyricEvent
+	      'duration duration
+	      'text string))
+
+(define-safe-public (make-span-event type span-dir)
+  (make-music type
+	      'span-direction span-dir))
 
 (define-public (set-mus-properties! m alist)
   "Set all of ALIST as properties of M." 
   (if (pair? alist)
       (begin
-	(ly:set-mus-property! m (caar alist) (cdar alist))
-	(set-mus-properties! m (cdr alist)))
-  ))
+	(set! (ly:music-property m (caar alist)) (cdar alist))
+	(set-mus-properties! m (cdr alist)))))
 
 (define-public (music-separator? m)
   "Is M a separator?"
-  (let* ((ts (ly:get-mus-property m 'types )))
-    (memq 'separator ts)
-  ))
-
+  (let ((ts (ly:music-property m 'types)))
+    (memq 'separator ts)))
 
 ;;; splitting chords into voices.
-
 (define (voicify-list lst number)
-   "Make a list of Musics.
+  "Make a list of Musics.
 
    voicify-list :: [ [Music ] ] -> number -> [Music]
    LST is a list music-lists.
-"
-
-   (if (null? lst) '()
-       (cons (context-spec-music
-	      (make-sequential-music
-	       (list
-		(make-voice-props-set number)
-		(make-simultaneous-music (car lst))))
 
-	      "Voice"  (number->string number))
-	      (voicify-list (cdr lst) (+ number 1))
-       ))
-   )
+   NUMBER is 0-base, i.e. Voice=1 (upstems) has number 0.
+"
+  (if (null? lst)
+      '()
+      (cons (context-spec-music
+	     (make-sequential-music
+	      (list (make-voice-props-set number)
+		    (make-simultaneous-music (car lst))))
+	     'Voice  (number->string (1+ number)))
+	    (voicify-list (cdr lst) (1+ number)))))
 
 (define (voicify-chord ch)
   "Split the parts of a chord into different Voices using separator"
-   (let* ((es (ly:get-mus-property ch 'elements)))
-
+  (let ((es (ly:music-property ch 'elements)))
+    (set! (ly:music-property  ch 'elements)
+	  (voicify-list (split-list-by-separator es music-separator?) 0))
+    ch))
+
+(define-public (voicify-music m)
+  "Recursively split chords that are separated with \\ "
+  (if (not (ly:music? m))
+      (ly:error (_ "music expected: ~S") m))
+  (let ((es (ly:music-property m 'elements))
+	(e (ly:music-property m 'element)))
 
-     (ly:set-mus-property!  ch 'elements
-       (voicify-list (split-list es music-separator?) 0))
-     ch
-   ))
-
-(define (voicify-music m)
-   "Recursively split chords that are separated with \\ "
-   
-   (if (not (ly:music? m))
-       (begin (display m)
-       (error "not music!"))
-       )
-   (let*
-       ((es (ly:get-mus-property m 'elements))
-	(e (ly:get-mus-property m 'element))
-	)
-     (if (pair? es)
-	 (ly:set-mus-property! m 'elements (map voicify-music es)))
-     (if (ly:music? e)
-	 (ly:set-mus-property! m 'element  (voicify-music e)))
-     (if
-      (and (equal? (ly:music-name m) "Simultaneous_music")
-	   (reduce (lambda (x y ) (or x y)) #f (map music-separator? es)))
-      (voicify-chord m)
-      )
-
-     m
-     ))
+    (if (pair? es)
+	(set! (ly:music-property m 'elements) (map voicify-music es)))
+    (if (ly:music? e)
+	(set! (ly:music-property m 'element)  (voicify-music e)))
+    (if (and (equal? (ly:music-property m 'name) 'SimultaneousMusic)
+	     (reduce (lambda (x y ) (or x y)) #f (map music-separator? es)))
+	(set! m (context-spec-music (voicify-chord m) 'Staff)))
+    m))
 
 (define-public (empty-music)
-  (ly:export (make-music-by-name 'Music))
-  )
-;;;
+  (ly:export (make-music 'Music)))
 
-; Make a function that checks score element for being of a specific type. 
+;; Make a function that checks score element for being of a specific type. 
 (define-public (make-type-checker symbol)
   (lambda (elt)
-    ;;(display  symbol)
-    ;;(eq? #t (ly:get-grob-property elt symbol))
-    (not (eq? #f (memq symbol (ly:get-grob-property elt 'interfaces))))))
+    ;;(display	symbol)
+    ;;(eq? #t (ly:grob-property elt symbol))
+    (not (eq? #f (memq symbol (ly:grob-property elt 'interfaces))))))
+
+(define-public ((outputproperty-compatibility func sym val) grob g-context ao-context)
+  (if (func grob)
+      (set! (ly:grob-property grob sym) val)))
+
+
+(define-public ((set-output-property grob-name symbol val)  grob grob-c context)
+  "Usage:
+
+\\applyoutput #(set-output-property 'Clef 'extra-offset '(0 . 1))
+
+"
+  (let ((meta (ly:grob-property grob 'meta)))
+    (if (equal?  (cdr (assoc 'name meta)) grob-name)
+	(set! (ly:grob-property grob symbol) val))))
 
 
 ;;
 (define-public (smart-bar-check n)
-  "Make  a bar check that checks for a specific bar number. 
+  "Make	 a bar check that checks for a specific bar number. 
 "
-  (let*
-      (
-       (m (make-music-by-name 'ApplyContext))
-       )
-    
+  (let ((m (make-music 'ApplyContext)))
     (define (checker tr)
-      (let* ((bn (ly:get-context-property tr 'currentBarNumber)))
-	(if (= bn  n)
+      (let* ((bn (ly:context-property tr 'currentBarNumber)))
+	(if (= bn n)
 	    #t
-	    (error
-	     (format "Bar check failed, we should have reached ~a, instead at ~a\n"
-		     n bn ))
-	    )))
+	    (ly:error
+	     ;; FIXME: uncomprehensable message
+	     (_ "Bar check failed.  Expect to be at ~a, instead at ~a")
+	     n bn))))
+    (set! (ly:music-property m 'procedure) checker)
+    m))
 
-    (ly:set-mus-property! m 'procedure checker)
-    m
-    ))
+
+(define-public (skip->rest mus)
+
+  "Replace MUS by RestEvent of the same duration if it is a
+SkipEvent. Useful for extracting parts from crowded scores"
+
+  (if  (memq (ly:music-property mus 'name) '(SkipEvent SkipMusic))
+   (make-music 'RestEvent 'duration (ly:music-property mus 'duration))
+   mus))
+
+
+(define-public (music-has-type music type)
+  (memq type (ly:music-property music 'types)))
+
+(define-public (music-clone music)
+  (define (alist->args alist acc)
+    (if (null? alist)
+	acc
+	(alist->args (cdr alist)
+		     (cons (caar alist) (cons (cdar alist) acc)))))
+
+  (apply
+   make-music
+   (ly:music-property music 'name)
+   (alist->args (ly:music-mutable-properties music) '())))
 
 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
 ;; warn for bare chords at start.
 
-(define (has-request-chord elts)
-  (reduce (lambda (x y) (or x y)) #f (map (lambda (x) (equal? (ly:music-name x)
-							   "Request_chord")) elts)
-  ))
-
-(define (ly:music-message music msg)
-  (let*
-      (
-      (ip (ly:get-mus-property music 'origin))
-      )
 
+(define-public (ly:music-message music msg)
+  (let ((ip (ly:music-property music 'origin)))
     (if (ly:input-location? ip)
 	(ly:input-message ip msg)
-	(ly:warn msg))
-  ))
-  
-(define (check-start-chords music)
-  "Check music expression for a Simultaneous_music containing notes\n(ie. Request_chords), without context specification. Called  from parser."
+	(ly:warning msg))))
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;;
+;; setting stuff for grace context.
+;;
+
+(define (vector-extend v x)
+  "Make a new vector consisting of V, with X added to the end."
+  (let* ((n (vector-length v))
+	 (nv (make-vector (+ n 1) '())))
+    (vector-move-left! v 0 n nv 0)
+    (vector-set! nv n x)
+    nv))
+
+(define (vector-map f v)
+  "Map	F over V. This function returns nothing."
+  (do ((n (vector-length v))
+       (i 0 (+ i 1)))
+      ((>= i n))
+    (f (vector-ref v i))))
+
+(define (vector-reverse-map f v)
+  "Map	F over V, N to 0 order. This function returns nothing."
+  (do ((i (- (vector-length v) 1) (- i 1)))
+      ((< i 0))
+    (f (vector-ref v i))))
+
+;; TODO:  make a remove-grace-property too.
+(define-public (add-grace-property context-name grob sym val)
+  "Set SYM=VAL for GROB in CONTEXT-NAME. "
+  (define (set-prop context)
+    (let* ((where (ly:context-property-where-defined context 'graceSettings))
+	   (current (ly:context-property where 'graceSettings))
+	   (new-settings (append current
+				 (list (list context-name grob sym val)))))
+      (ly:context-set-property! where 'graceSettings new-settings)))
+  (ly:export (context-spec-music (make-apply-context set-prop) 'Voice)))
+
+
+
+(defmacro-public def-grace-function (start stop)
+  `(define-music-function (parser location music) (ly:music?)
+     (make-music 'GraceMusic
+		 'origin location
+		 'element (make-music 'SequentialMusic
+				      'elements (list (ly:music-deep-copy ,start)
+						      music
+						      (ly:music-deep-copy ,stop))))))
+
+(defmacro-public define-music-function (args signature . body)
+  "Helper macro for `ly:make-music-function'.
+Syntax:
+  (define-music-function (parser location arg1 arg2 ...) (arg1-type? arg2-type? ...)
+    ...function body...)
+"
+  `(ly:make-music-function (list ,@signature)
+			   (lambda (,@args)
+			     ,@body)))
+
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(define-public (cue-substitute quote-music)
+  "Must happen after quote-substitute."
   
-     (let*
-       ((es (ly:get-mus-property music 'elements))
-	(e (ly:get-mus-property music 'element))
-	(name (ly:music-name music)) 
-	)
+  (if (vector? (ly:music-property quote-music 'quoted-events))
+      (let* ((dir (ly:music-property quote-music 'quoted-voice-direction))
+	     (main-voice (if (eq? 1 dir) 1 0))
+	     (cue-voice (if (eq? 1 dir) 0 1))
+	     (main-music (ly:music-property quote-music 'element))
+	     (return-value quote-music))
+
+	(if (or (eq? 1 dir) (eq? -1 dir))
+	    
+	    ;; if we have stem dirs, change both quoted and main music
+	    ;; to have opposite stems.
+	    (begin
+	      (set! return-value
+
+		    ;; cannot context-spec Quote-music, since context
+		    ;; for the quotes is determined in the iterator.
+		    (make-sequential-music
+		     (list
+		      (context-spec-music (make-voice-props-set cue-voice) 'CueVoice "cue")
+		      quote-music
+		      (context-spec-music (make-voice-props-revert)  'CueVoice "cue"))))
+	      (set! main-music
+		    (make-sequential-music
+		     (list
+		      (make-voice-props-set main-voice)
+		      main-music
+		      (make-voice-props-revert))))
+	      (set! (ly:music-property quote-music 'element) main-music)))
+
+	return-value)
+      quote-music))
+
+(define-public ((quote-substitute quote-tab) music)
+  (let* ((quoted-name (ly:music-property music 'quoted-music-name))
+	 (quoted-vector (if (string? quoted-name)
+			    (hash-ref quote-tab quoted-name #f)
+			    #f)))
+
+    
+    (if (string? quoted-name)
+	(if (vector? quoted-vector)
+	    (begin
+	      (set! (ly:music-property music 'quoted-events) quoted-vector)
+	      (set! (ly:music-property music 'iterator-ctor)
+		    ly:quote-iterator::constructor))
+	    (ly:warning (_ "cannot find quoted music: `~S'") quoted-name)))
+    music))
 
-       (cond 
-	 ((equal? name "Context_specced_music") #t)
-	 ((equal? name "Simultaneous_music")
-
-	  (if (has-request-chord es)
-	      (ly:music-message music "Starting score with a chord.\nPlease insert an explicit \\context before chord")
-	      (map check-start-chords es)))
-	 
-	 ((equal? name "Sequential_music")
-	   (if (pair? es)
-	       (check-start-chords (car es))))
-	  (else (if (ly:music? e) (check-start-chords e )))
-       
-       ))
-     music
-     )
 
 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
 ;; switch it on here, so parsing and init isn't checked (too slow!)
-
+;;
 ;; automatic music transformations.
 
 (define (switch-on-debugging m)
-  (set-debug-cell-accesses! 15000)
-  m
-  )
+  (if (defined? 'set-debug-cell-accesses!)
+      (set-debug-cell-accesses! 15000))
+  m)
+
+(define (music-check-error music)
+  (define found #f)
+  (define (signal m)
+    (if (and (ly:music? m)
+	     (eq? (ly:music-property m 'error-found) #t))
+	(set! found #t)))
+  
+  (for-each signal (ly:music-property music 'elements))
+  (signal (ly:music-property music 'element))
+
+  (if found
+      (set! (ly:music-property music 'error-found) #t))
+  music)
+
+(define (precompute-music-length music)
+  (set! (ly:music-property music 'length)
+	(ly:music-length music))
+  music)
+
+(define (skip-to-last music parser)
+
+  "Replace MUSIC by
+
+<< { \\set skipTypesetting = ##t
+     LENGTHOF(\\showLastLength)
+     \\set skipTypesetting = ##t  }
+    MUSIC >>
+
+if appropriate.
+ "
+  (let*
+      ((show-last  (ly:parser-lookup parser 'showLastLength)))
+    
+    (if (ly:music? show-last)
+	(let*
+	    ((orig-length (ly:music-length music))
+	     (skip-length (ly:moment-sub orig-length (ly:music-length show-last))))
+
+	  (make-simultaneous-music
+	   (list
+	    (make-sequential-music
+	     (list
+	      (context-spec-music (make-property-set 'skipTypesetting #t)
+				  'Score)
+	      (make-music 'SkipMusic 'duration
+			  (ly:make-duration
+			   0 0
+			   (ly:moment-main-numerator skip-length)
+			   (ly:moment-main-denominator skip-length)))
+	      (context-spec-music (make-property-set 'skipTypesetting #f)
+				  'Score)))
+	    music)))
+	music)))
+    
 
 (define-public toplevel-music-functions
-  (list check-start-chords
-	voicify-music
-	(lambda (x) (music-map glue-mm-rest-texts x))
-; switch-on-debugging
-	))
+  (list
+   (lambda (music parser) (voicify-music music))
+   (lambda (x parser) (music-map music-check-error x))
+   (lambda (x parser) (music-map precompute-music-length x))
+   (lambda (music parser)
+
+     (music-map (quote-substitute (ly:parser-lookup parser 'musicQuotes))  music))
+   
+   ;; switch-on-debugging
+   (lambda (x parser) (music-map cue-substitute x))
+ 
+   (lambda (x parser)
+     (skip-to-last x parser)
+   )))
+
+
+;;;;;;;;;;;;;;;;;
+;; lyrics
+
+(define (apply-durations lyric-music durations) 
+  (define (apply-duration music)
+    (if (and (not (equal? (ly:music-length music) ZERO-MOMENT))
+	     (ly:duration?  (ly:music-property music 'duration)))
+	(begin
+	  (set! (ly:music-property music 'duration) (car durations))
+	  (set! durations (cdr durations)))))
+  
+  (music-map apply-duration lyric-music))
 
 
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; accidentals
+
+(define-public (set-accidentals-properties extra-natural
+					   auto-accs auto-cauts
+					   context)
+  (context-spec-music
+   (make-sequential-music
+    (append (if (boolean? extra-natural)
+		(list (make-property-set 'extraNatural extra-natural))
+		'())
+	    (list (make-property-set 'autoAccidentals auto-accs)
+		  (make-property-set 'autoCautionaries auto-cauts))))
+   context))
+
+(define-public (set-accidental-style style . rest)
+  "Set accidental style to STYLE. Optionally takes a context argument,
+e.g. 'Staff or 'Voice. The context defaults to Voice, except for piano styles, which
+use GrandStaff as a context. "
+  (let ((context (if (pair? rest)
+		     (car rest) 'Staff))
+	(pcontext (if (pair? rest)
+		      (car rest) 'GrandStaff)))
+    (ly:export
+     (cond
+      ;; accidentals as they were common in the 18th century.
+      ((equal? style 'default)
+       (set-accidentals-properties #t '(Staff (same-octave . 0))
+				   '() context))
+      ;; accidentals from one voice do NOT get cancelled in other voices
+      ((equal? style 'voice)
+       (set-accidentals-properties #t '(Voice (same-octave . 0))
+				   '() context))
+      ;; accidentals as suggested by Kurt Stone, Music Notation in the 20th century.
+      ;; This includes all the default accidentals, but accidentals also needs cancelling
+      ;; in other octaves and in the next measure.
+      ((equal? style 'modern)
+       (set-accidentals-properties #f '(Staff (same-octave . 0) (any-octave . 0) (same-octave . 1))
+				   '()	context))
+      ;; the accidentals that Stone adds to the old standard as cautionaries
+      ((equal? style 'modern-cautionary)
+       (set-accidentals-properties #f '(Staff (same-octave . 0))
+				   '(Staff (any-octave . 0) (same-octave . 1))
+				   context))
+      ;; Multivoice accidentals to be read both by musicians playing one voice
+      ;; and musicians playing all voices.
+      ;; Accidentals are typeset for each voice, but they ARE cancelled across voices.
+      ((equal? style 'modern-voice)
+       (set-accidentals-properties  #f
+				    '(Voice (same-octave . 0) (any-octave . 0) (same-octave . 1)
+					    Staff (same-octave . 0) (any-octave . 0) (same-octave . 1))
+				    '()
+				    context))
+      ;; same as modernVoiceAccidental eccept that all special accidentals are typeset
+      ;; as cautionaries
+      ((equal? style 'modern-voice-cautionary)
+       (set-accidentals-properties #f
+				   '(Voice (same-octave . 0))
+				   '(Voice (any-octave . 0) (same-octave . 1)
+					   Staff (same-octave . 0) (any-octave . 0) (same-octave . 1))
+				   context))
+      ;; stone's suggestions for accidentals on grand staff.
+      ;; Accidentals are cancelled across the staves in the same grand staff as well
+      ((equal? style 'piano)
+       (set-accidentals-properties #f
+				   '(Staff (same-octave . 0)
+					   (any-octave . 0) (same-octave . 1)
+					   GrandStaff (any-octave . 0) (same-octave . 1))
+				   '()
+				   pcontext))
+      ((equal? style 'piano-cautionary)
+       (set-accidentals-properties #f
+				   '(Staff (same-octave . 0))
+				   '(Staff (any-octave . 0) (same-octave . 1)
+					   GrandStaff (any-octave . 0) (same-octave . 1))
+				   pcontext))
+      
+      ;; do not set localKeySignature when a note alterated differently from
+      ;; localKeySignature is found.
+      ;; Causes accidentals to be printed at every note instead of
+      ;; remembered for the duration of a measure.
+      ;; accidentals not being remembered, causing accidentals always to
+      ;; be typeset relative to the time signature
+      
+      ((equal? style 'forget)
+       (set-accidentals-properties '()
+				   '(Staff (same-octave . -1))
+				   '() context))
+      ;; Do not reset the key at the start of a measure.  Accidentals will be
+      ;; printed only once and are in effect until overridden, possibly many
+      ;; measures later.
+      ((equal? style 'no-reset)
+       (set-accidentals-properties '()
+				   '(Staff (same-octave . #t))
+				   '()
+				   context))
+      (else
+       (ly:warning (_ "unknown accidental style: ~S" style))
+       (make-sequential-music '()))))))
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(define-public (skip-of-length mus)
+  "Create a skip of exactly the same length as MUS."
+  (let* ((skip
+	  (make-music
+	   'SkipEvent
+	   'duration (ly:make-duration 0 0))))
+
+    (make-event-chord (list (ly:music-compress skip (ly:music-length mus))))))
+
+(define-public (mmrest-of-length mus)
+  "Create a mmrest of exactly the same length as MUS."
+  
+  (let* ((skip
+	  (make-multi-measure-rest
+	   (ly:make-duration 0 0) '())))
+    (ly:music-compress skip (ly:music-length mus))
+    skip))
+
+(define-public (pitch-of-note event-chord)
+
+  (let*
+      ((evs (filter (lambda (x) (memq 'note-event (ly:music-property x 'types)))
+		    (ly:music-property event-chord 'elements))))
+
+    (if (pair? evs)
+	(ly:music-property (car evs) 'pitch)
+	#f)))
+