elements ((music 'ContextSpeccedMusic
context-id "up"
context-type 'Staff
- element (music 'SimultaneousMusic elements (?ac-music)))
+ element ?ac-music)
+ (music 'ContextSpeccedMusic
+ context-id "up"
+ context-type 'Staff)
(music 'ContextSpeccedMusic
context-id "down"
context-type 'Staff))))