You're talking about muscle memory in regards to playing music, which is just a motor task committed to memory through repetition.

Yes we have no choice in regards to say keeping our heart pumping or our hair and fingernails growing. But that is to do with survival pure and simple.

Free will is about choosing an action or a path to take. We are influenced by things such as a dopamine hit, and yes in addicts we see this free will curtailed.

But I would definitely say that we as a species have free will. I'd love to have the excuse of blaming fate or God for my preordained actions but sadly I don't think we have a loop hole here.