I'm all over the map in what I like. Mostly older stuff, 60's, 70s, and 80's. I'll try anything, but don't really care for most of what passes as popular music today, i.e. modern country, top 40 "American Idol stuff, Hip-Hop. etc... Just too old to get it I guess.
Some of my favorite groups / artists are: Jethro Tull, XTC, Roxy Music, Beatles, Byrds, Indigo Girls, Loreena McKennitt, Steeleye Span, AC/DC, Queensryche, Rolling Stones, The Who, Grateful Dead, Black Sabbath, Fairport Convention, Sandy Denny, Collective Soul, Elvis Costello, Guns N Roses and so on...