I freely admit everything, and have no shame. So there isn't one, really. But a short list of what somebody here will doubtless view as horrible sins follows.
D12 (Instigator and Fight Music are marvelous for when you're feeling maleviolent and decide to take it out on some helpless newbies online.)
Eminem
Two-Mix (JPop ftw.)
The Fray (Only a couple of tracks, to be honest. How to Save a Life is the only one I listen to with any regularity.)
Linkin Park (Well, some. I've kinda grown out of a lot it, since I'm not as emo as I was in highschool. I'm still hunting for a particular mix of My December though.)
Limp Bizkit
All kinds of '80s stuff. (I've been known to sing along to Take My Breath Away and several things by Phil Collins on occasion, though very softly. If that doesn't scare you ****less, you're not human.)
Bits and pieces of the Intial D soundtrack. (Stay is the only one to which I remember the name to off the top of my head, but there are four or five more. Couple more that are rap in Japanese, too.)
Yukarie (Japanese jazz; did the ending for Blue Submarine #6 if you saw that.)
Paul Oakenfold
Darude
Sailor Moon soundtrack (FEAR THE MAGICAL GIRL SHOWS.)