first youre going to want dubstep. everyone likes dubstep. you can search for skrillex, hes the best.
then next youre going to want some underground rap like biggie smalls and tupack and shit...
after you get that youre going to want some wu-tang, that fucking gang ass shit. you can just google "mad nigga beatz"
sparknotes: skrilex, wutang, biggie, katy perry and tupack