I saw Skrillex live - he is by far the most AMAZING live act.
Dubstep - so many: Skrillex, Bar 9, Emalkay, Flux Pavilion, Doctor P, Gemini, Borgore, Modestep, etc...
DnB - so many again: Sub Focus, Hype, Hazard, Fresh, Camo & Krooked, Stan SB, Hectix, Chase and Status, etc...
Some Rock - Linkin Park, Papa Roach, Yellowcard, Simple Plan, Relient K, MCR...
Hip Hop - Eminem, Dre, Snoop, Jay Z, Kanye West, Tupac, Biggie, Big Von, Fat Joe, Ja Rule, Scribe, Outkast, Jedi Mind, Hilltop Hoods, Dead Prez...
Grime - Kano, Sway, JME, Devlin...
Basically I <3 Music