Oh man, where to start?
In no order; Eminem, 2Pac, Eazy-E, Dr. Dre, Ludacris, KMK, Atmosphere, Living Legends, MURS, Bone-Thugs-N-Harmony, DMX (Ending with the album '...and then there was X'), Immortal Technique, Much Sticky, SPM, Tech N9ne, Too $hort, Westside - Connection, Ice Cube, Wu-Tang, Big L.
A lot more, but that's a couple off the top of my head.