For the record: These topics never work out well on here. Any time any one tries to ask about "guilty pleasures", you get a couple of people who argue that you shouldn't have any guilty pleasures or "blah blah open-mindedness blah".
For the record:
I really like a lot of stuff by the Foo Fighters and the Goo Goo Dolls. Also, I like a couple of musicals - don't tell anyone. I like other non-metal stuff, but frankly I don't feel like Classical music should be a guilty pleasure.