+ '((() . (StreamEvent))
+ (StreamEvent .
+ (RemoveContext ChangeParent Override Revert UnsetProperty
+ SetProperty music-event OldMusicEvent CreateContext Prepare
+ OneTimeStep Finish))
+ (music-event . (annotate-output-event footnote-event
+ arpeggio-event breathing-event extender-event span-event
+ rhythmic-event dynamic-event break-event label-event percent-event
+ key-change-event string-number-event stroke-finger-event tie-event
+ part-combine-event part-combine-force-event
+ beam-forbid-event script-event tempo-change-event
+ tremolo-event bend-after-event fingering-event glissando-event
+ harmonic-event hyphen-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 completize-extender-event break-span-event
+ alternative-event))
+
+ (layout-instruction-event . (apply-output-event))
+ (script-event . (articulation-event text-script-event))
+ (part-combine-event . (solo-one-event solo-two-event unisono-event))
+ (break-event . (line-break-event page-break-event page-turn-event))
+ (dynamic-event . (absolute-dynamic-event))
+ (span-event . (span-dynamic-event beam-event episema-event ligature-event
+ pedal-event phrasing-slur-event slur-event staff-span-event
+ text-span-event trill-span-event tremolo-span-event
+ tuplet-span-event))
+ (span-dynamic-event . (decrescendo-event crescendo-event))
+ (break-span-event . (break-dynamic-span-event))
+ (pedal-event . (sostenuto-event sustain-event una-corda-event))
+ (rhythmic-event . (lyric-event melodic-event multi-measure-rest-event
+ double-percent-event percent-event
+ repeat-slash-event rest-event
+ skip-event bass-figure-event))
+ (melodic-event . (cluster-note-event note-event))
+ (() . (Announcement))
+ (Announcement . (AnnounceNewContext))