printed as numbers, but only as extender lines.")
(implicitTimeSignatureVisibility ,vector? "break visibility for
the default time signature.")
+ (includeGraceNotes ,boolean? "Do not ignore grace notes for
+@rinternals{Lyrics}.")
(instrumentCueName ,markup? "The name to print if another
instrument is to be taken.")
(instrumentEqualizer ,procedure? "A function taking a string