(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")
(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. ")