Did you know that Physics and Music are related–that you can teach these subjects in tandem to your older, musically inclined students?
The site, http://www.phys.unsw.edu.au/music/ explains the acoustics of many instruments. Basic information is given as well as more complex material.
If your child understands the science behind the music s/he is playing, perhaps your student will have the tools to improve his/her performance.
It’s certainly an interesting subject!
And remember, fun learning is forever learning!