Alternative rock, indie, musical theater, that weird blend of Jazz and Hip-Hop that Nujabes pulled off so well, just... whatever sounds good to me. Indie pop. Yoko Kanno. Icelandic experimental electronica. Opera. As long as I like the song, the genre doesn't matter.
Okay, not just metal, though it is one of my favorites. I have at least something I enjoy from an incredibly diverse set of styles, but others I'd count among my favorites include classical, folk, experimental, various types of electronic music,and progressive rock.