Alright... I'm just going to name all of the artists in my itunes. XD
AFI, Andrew Lloyd Webber (Phantom of the Opera), Agnels & Airwaves, Arctic Monkeys, Blaqk Audio (Just as a warning, some of their music is kinda... yeah. ._. Just listen to Between Breaths and Again, Again and Again and you'll see what I mean. ._. ), Blink-182, Cage the Elephant, The Cure, Daft Punk, Dropkick Murphys, Flogging Molly, FRANZ FERDINANDDDD, Jeff Bowen ([title of show]), Jimmy Eat World, The Karelia, The Killers, LUDO, THE MATCHES, Matt and Kim, MGMT, Motion City Soundtrack, Muse, Nightwish, THE OFFSPRINGGG, Old 97s, The Postal Service, The Rasmus, Red Jumpsuit Apparatus, Richard Cheese (He does HILARIOUS covers), Rise Against, Shinedown, Silversun Pickups, STEPHEN SONDHEIMMMM, Streetlight Manifesto, The Strokes, Switchfoot (I don't even like them that much any more, though >_>), Three Days Grace, Bad Religion... I could go on. I also have a lot of stuff I like that's /not/ in my library. E.g. Duran Duran, Talking Heads, Cut Copy, etc etc.