The stuff that isn't referred to as "rap".
Old school stuff, generally. Before the turn of the century. Nas, Gang Starr, KRS-One, Rakim, Big L, older OutKast, et cetera.
The only "newer" stuff I can stand consists of Little Brother, Cormega, and Immortal Technique. Those guys at least have some lyrics going. The rest of the stuff out now, such as Lil Wayne and Akon, is just noise pollution.