(music 'ContextSpeccedMusic
context-id "shared"
context-type 'Voice)
+ (music 'ContextSpeccedMusic
+ context-id "solo"
+ context-type 'Voice)
+ (music 'ContextSpeccedMusic
+ context-id "null"
+ context-type 'NullVoice)
?pc-music))))
(with-music-match
(?pc-music (music 'PartCombineMusic))