I think your love of music is a great thing, but don't let it overtake you. When I listen too long to the same song (which I sometimes do), it makes me somehow disconnect with the world around me, and then I just think about that song. If I listen to a lot of very up-beat music it has the same effect, just to a much stronger degree. Makes me hypo.
I think we sometimes underestimate the effect music have on our brain. Our sense of hearing is a very fine-tuned thing, and it is directly connected with different parts of our brain. Music can have a very powerful emotional effect.
And remember that us BPs have a tendency of becoming sligthly obsessed with certain things, and letting that overshadow other things.
Listening to certain songs, over and over again, has as strong an effect on me as drinking alcohol... (great, but not always great!)