Not to listen to music while you draw or animate (same thing) I just read this in a book written by Richard Williams and it was a page I kept disregarding then I decided to read it. (Those of you who dont know who he is he is the guy that was the animation director behind Who Framed Roger Rabbit, If you never heard of that movie or never seen it well I advise you do so immediatly)
They say not to do it and you will see more improvement in your work, it has to do with when you listen to music your concentrating on more then one thing even when you dont relize it. It was even tested on student artists and they saw improvement.
Im going to put that to the test now for myself and get back you you guys after the first reply.