Okay...hard one...
1) you should choose the one you would get the highest grade in...sounds like music for you?
BUT
2) Choose one which is seen as a tougher option by Unis: French
Well, i do know that unis LOVE languages and they are seen as v useful - as Yogity said before me =]
If it were my choice i would choose french, however, its not mine its yours...and i dont enjoy music as much as you...im actually in Y11 atm anyways but i may be taking music nxt year =]
X g luck