2.3.2 Music function usage

A ‘music function’ has to return an expression matching the predicate ly:music?. This makes music function calls suitable as arguments of type ly:music? for another music function call.

When using a music function call in other contexts, the context may cause further semantic restrictions.

‘Polymorphic’ functions, like \tweak, can be applied to post-events, chord constituent and top level music expressions.

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LilyPond — Extending v2.19.62 (development-branch).