Originally Posted by Martian

Also, the colours do not change. I've never really bothered to try to figure out what makes different sounds different colours (I have the vague idea that it may be modal, but haven't tested this). I find it easiest to liken the perception to vision, since that's really what it is. Grass is green. That does not change and barring physical trauma your perception of green never changes either. For me, a green song is always a green song. It's a similarly base property of the music.