To my knowledge, and I may be wrong. I was told that bp's dont really hear like we do, but they do feel the vibrations. I like lots of different kind of music, and my bp's never really seem to be bothered by it, but then again, I dont do it really loud either.
As far as handling... I handle my bp's for many hours a day... each one of them, and I have 3. I dont think they really mind so much being picked up..cause they all seem to have personalities, and all but one of my boys, seems to "beg" for attention. Sometimes they are just more responsive or reactive at different times. I think as long as you dont see any stress coming from it, then dont worry about it.
My boys are pretty use to the attention. I have always been very much involved with them, but I think I may not be the only one like this..I think it just depends on the snake.