+ (TransposedMusic
+ . (
+ (description . "Music that has been transposed.")
+ (iterator-ctor . ,ly:music-wrapper-iterator::constructor)
+ (start-callback . ,ly:music-wrapper::start-callback)
+ (length-callback . ,ly:music-wrapper::length-callback)
+ (to-relative-callback . ,ly:relative-octave-music::no-relative-callback)
+ (types . (music-wrapper-music general-music transposed-music))
+ ))
+