Music is man's greatest invention, above language, mathematics, engineering, philosophy, or any of these things. It gives humans the ability to communicate through forms that we don't necessarily control rationally. I've read some pretty amazing poetry, and seen some remarkable art, but it's never "affected" me to the extent my spine tingles and I get goosebumps. Yet ordinary "Joe's" making music do that to me. For me, the genre of prog metal is the avenue that most communicates with me. Perhaps, it was the impression fates warning made on me when I was an impressionable 16 year old. Why do people gravitate to different forms of music? That involves human communication beyond the rational, beyond the verbal or visible. It is something that involves an individual's passion. Asking it is not unreasonable, but pursuing the answer is somewhat akin to asking "why did that person fall in love with this person?" It involves such a crazy mix of emotion, experience, passion, and indeed, TIMING in one's life. We often tend to ignore the timing aspect, but I think that has a role.