Ok, those are some plausible explanations. But for listening to R&R on an iPod, no one notices or cares if the drums start on the left then build up on the right and a guitar comes in from the right and builds on the left, do they?
If I recall correctly, the left brain is linked to logic and analysis and right brain is linked to creativity and intuition and each is linked to the opposite side of the body. Therefore, in theory, one’s left ear correlates to logic and right ear correlates to creativity. But no one actually creates music with that in mind, do they?
I’m reminded of the great song (maybe the whole album) off of Dark Side of the Moon, where the sounds circle around, coming from all different directions. Pretty cool, particularly when one is 19 years old and experimenting with illicit substances. But wouldn’t it be equally cool if the earphones were reversed and everything circulated backwards?