Madlib holds a position as an underground hip-hop legend—but the producer's beats have traveled way beyond the subterranean scene. Check out his off-kilter and wildly creative concoctions bedding raps from the likes of Ghostface, De La Soul, and Mos Def. The reclusive beatmaker has also proven his prowess in the R&B world with joints for Erykah Badu and Georgia Anne Muldrow.