Will this allow
trans-cis = \transpose c cis \etc
?
Then I'd say it's a great improvement.
Far better than having to do:
my-trans =
#(define-scheme-function (parser location from to) (ly:pitch? ly:pitch?)
(define-music-function (parser location music) (ly:music?)
#{ \transpose $from $to $music #}))
trans-cis = \my-trans c cis
https://codereview.appspot.com/249670043/
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