Great concept, but needs polishing
The concept is really original and there's a lot of potential there. The choreography of the instruments was really well done, and fun to watch.
The problem is that the gameplay really needs work... it just didn't have that "fun" factor. In fact, I found myself wishing that I didn't have to dodge notes or shoot anything, and that I could just watch.
Definitely play with this idea more... perhaps the game could consist of pressing buttons in time with the instruments, or something similar.