On 2018-05-11 09:34, David Kastrup wrote:
There is no "incomplete music expression". #{ ... #} is used for
converting a whole slew of different expression types from LilyPond
syntax to Scheme: pitches, durations, markups, music, numbers with
dimension and other stuff. A pitch is not an "incomplete music
expression". It's a type of its own.
The error message reads pretty clearly, though. The result of a music
function cannot be a single NOTENAME_PITCH.
Of course, if returning a single pitch *is* valid for a music function,
then either the error message is misleading or there is a underlying bug
that needs to be addressed.
-- Aaron Hill
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