You can hear music in the astral plane in a way that simply isn't possible with your meat suit. You hear with your whole, entire being - your soul. The music goes through you at the perfect volume for intensity and kind of just absorbs you completely, it's absolutely amazing. Additionally, composing great pieces on the fly seems to be pretty easy. There are some kind of effects and sounds which don't seem to have an earth equivalent - in terms of what kind of instrument, etc.. would produce it. Experience it for yourself by learning how to astral project...or just wait for the long, long one .