(RemoveContext
ChangeParent Override Revert UnsetProperty SetProperty
music-event OldMusicEvent CreateContext Prepare
- OneTimeStep Finish))
+ OneTimeStep Finish GraceChange))
(music-event . (annotate-output-event
footnote-event arpeggio-event breathing-event
extender-event span-event rhythmic-event dynamic-event
laissez-vibrer-event mark-event multi-measure-text-event
note-grouping-event pes-or-flexa-event repeat-tie-event
spacing-section-event layout-instruction-event
+ time-signature-event
completize-extender-event break-span-event alternative-event))
(layout-instruction-event . (apply-output-event))