Via Vulture, here's Eminem doing Dre lyrics. This was actually educational for me—the qualitative difference between Em doing Em and Em doing Dre is substantial. It's not that he does a bad imitation, to the contrary it's very good one and thus unwittingly illustrative of the boring drone that is Dr. Dre rhyming. Hearing Eminem's voice I kept waiting for his awesome, unpredictable cadence and acid humor. Instead we just got vanilla Dre. 

Dr. Dre featuring Eminem, Nas - Topless by Hypetrak