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1.1.33 KeyChangeEvent
Change the key signature.
Syntax: \key name scale
Event classes: key-change-event, music-event and StreamEvent.
Accepted by: Key_engraver and Key_performer.
Properties:
name(symbol):
'KeyChangeEventName of this music object.
to-relative-callback(procedure):
#<procedure #f (x p)>How to transform a piece of music to relative pitches.
types(list):
'(general-music key-change-event event)The types of this music object; determines by what engraver this music expression is processed.
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