+ (augmented ,boolean? "This figure is for an augmented figured bass (with +) sign.")
+ (associated-context ,string? "Name of the Voice context associated with this \\newaddlyrics section")
+ (bass ,boolean? "Set if this note is a bass note in a chord")
+ (bracket-start ,boolean? "start a bracket
+here. TODO: use SpanEvents?")
+ (bracket-stop ,boolean? "stop a bracket here.")
+ (break-penalty ,number? "Penalty for line break hint.")
+ (break-permission ,symbol? "Whether to allow, forbid or force a line break.")
+ (cautionary ,boolean? "If set, this alteration needs cautionary accidental")
+ (change-to-id ,string? "name of the context to change to ")
+ (change-to-type ,symbol? "type of the context to change to.")
+ (compress-procedure ,procedure? "compress this music expression. Argument 1: the music, arg 2: factor")
+ (context-id ,string? "name of context")
+ (context-type ,symbol? "type of context")
+ (create-new ,boolean? "Create a fresh context.")
+ (delta-step ,number? "How much should a fall change pitch?")
+ (descend-only ,boolean? "If set, this @code{\\context} will only descend in the context tree.")
+ (denominator ,integer? "denominator in a time signature")
+ (digit ,integer? "digit for fingering")
+ (diminished ,boolean? "This bass figure should be slashed.")
+ (direction ,ly:dir? "Print this up or down?")
+ (drum-type ,symbol? "Which percussion instrument to play this note on.")
+ (duration ,ly:duration? "Duration of this note/lyric.")
+ (error-found ,boolean? "If true, a parsing error was found in this expression")
+ (element ,ly:music? "The single child of a Music_wrapper music object, or the body of a repeat.")
+ (elements ,ly:music-list? "A list of elements for sequential of simultaneous music, or the alternatives of repeated music. ")
+ (elements-callback ,procedure? "Return a list of children, for use by a sequential iterator. Takes a single Music parameter")
+ (expected-beam-count ,integer? "Expected number of non-tremolo beams in a tremolo repeat")
+ (figure ,integer? "a bass figure")
+ (force-accidental ,boolean? "If set, a cautionary accidental should always be printed on this note")
+ (grob-property ,symbol? "The symbol of the grob property to set. ")
+ (grob-property-path ,list? "A list of symbols, locating a nested grob property, e.g. (beamed-lengths details). ")
+ (grob-value ,scheme? "The value of the grob property to set")
+ (input-tag ,scheme? "Arbitrary marker to relate input and output")
+ (inversion ,boolean? "If set, this chord note is inverted.")
+ (iterator-ctor ,procedure? "Function to construct music-event-iterator object for this Music")
+
+ (label ,markup? "label of a mark.")
+ (last-pitch ,ly:pitch? "The last pitch after relativization.")
+ (length ,ly:moment? "The duration of this music")
+ (length-callback ,procedure? "How to compute the duration of this music. This property can only be defined as initializer in @file{define-music-types.scm}.")
+ (metronome-count ,number? "How many beats in a minute?")
+ (name ,symbol? "Name of this music object")
+ (no-continuation ,boolean? "If set, disallow continuation lines")
+ (numerator ,integer? "numerator of a time signature")
+ (once ,boolean? "Apply this operation only during one time step?")
+ (octavation ,integer? "This pitch was octavated by how many octaves? For chord inversions, this is negative.")
+ (origin ,ly:input-location? "where was this piece of music defined?")
+ (part-combine-status ,symbol?
+ "Change to what kind of state? Options are
+solo1, solo2 and unisono")
+ (parenthesize ,boolean? "Enclose resulting objects in parentheses?")
+ (pitch ,ly:pitch? "the pitch of this note")
+ (pitch-alist ,list? "list of pitches jointly forming the scale of a key signature")
+ (pop-first ,boolean? "Do a revert before we try to do a override on some grob property.")
+ (prob-property ,symbol? "The symbol of the prob property to set. ")
+ (procedure ,procedure?
+ "The function to run with \\applycontext.
+It must take a single argument, being the context.")
+ (property-operations ,list?
+ "Do these operations for instantiating the context.")
+ (quoted-events ,vector? "A vector of with moment/event-list entries.")
+ (quoted-music-name ,string? "The name of the voice to quote.")
+ (quoted-voice-direction ,ly:dir? "Should the quoted voice be up-stem or down-stem?")
+ (quoted-context-type ,symbol? "The name of the context to direct quotes to, eg., @code{Voice}.")
+ (quoted-context-id ,string? "The id of the context to direct quotes to, eg., @code{cue}.")
+ (quoted-transposition ,ly:pitch? "The pitch used for the quote, overriding \\transposition")
+ (to-relative-callback ,procedure? "How to transform a piece of music to relative pitches")
+ (tweaks ,list? "An alist of properties to override in the backend
+for the grob made of this event.")
+
+ (repeat-count ,integer? "do a @code{\repeat} how ofen?")
+ (span-direction ,ly:dir? "Does this start or stop a spanner?")
+ (span-type ,string? "What kind of spanner should be created?