I'm a musician in real life and the instruments have rather a lot of actions they are missing. It would be nice to add some actions to instruments that can be used in performances. For instance, <name> finger picks his <stringed instrument> <sadly, happily, angrily....>. The pick action could also be used.

Percussive actions could be added for percussion instruments, tap, stomp, an individual clap. Things that help with timing.

I'm not a wind instrument person but I'm sure there are actions that would apply there as well.

Anyway, my two cents.

Thanks.