Am 12.03.2017 um 22:53 schrieb caag...@gmail.com:
You can't call music functions directly from Scheme code. You have to either wrap the call in #{ #} or use `ly:music-function-extract` to extract the procedure itself and call that.

In recent development versions, that’s obsolete. E.g.

{ #(bar "|.") }

and

{ ##{ \bar "|." #} }

are now completely equivalent.

Best, Simon

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