Sick Squid posted on a thread like this one some time ago. He did a degree in music (sorry can't be more specific as to what area of music) and he got into BA as a CEP (Cadet Entry Pilot).
So if you're out there Squidders I'm sure you can reiterate the wise words already posted above as to how doing the subject you enjoy can be a definate bonus.
VFE.
PS: Made me feel better when I heard you could get into the piloting game with a background of playing with organs. Oh-err! A joke about organs! New.