Aside from the aggressive, dark, or emotive nature of the music, one of the things I like so much about metal is that it is the only genre where most of the lyrics don't deal with girls/relationships. Surely, there must be some non-metal out there where the lyrics don't deal with girls/relationships. Instrumental suggestions are welcome. One quick note: I'm not into jazz. I've tried to get into it before, but it doesn't click with me for some reason.