I have sat a many nights with my mind expanding just listening to my utmost favorite music playing into my ears... through head phones of pure bliss...
iPod ftw! Couldn't stand to be immobile. Although now that I've got an iPhone and pandoras on that this could change everything!
I actually dont listen to music a lot while tripping, Im usually outside. Its weird, because Im a pretty music-oriented person, I dont know why its never come up.