I know BP's feel vibrations to hear and don't actually hear sound as we do, but I have my vivarium next to my computer/music production set-up and it doesn't seem to phase him in the slightest. He's still happily curled up into a ball or doing whatever he's doing and the music doesn't seem to disrupt him in any way. I'm sure he can feel the vibrations but he must have figued out by now that it's nothing bad/a predator etc.
With the way these snakes hear I imagine that your footsteps walking around the room are probably in effect louder to the snake than the loud music.