I would just find another way to make music. Another instruments, voice only, something with technology, etc.
I can't seeing "banning" really being possible. Being "unable" would mean not being able to use my hands. In that case, I'd probably be spending a lot of time learning how to live, how to do the basics, without hands, so that would occupy a lot of time.
If music were gone forever, I would just find some type of hobby, or a string of hobbies to fill up that time.