Head to the replies to check out Dr. Dre's video for "I Need a Doctor" featuring Eminem and Skylar Grey. This is the latest single off his upcoming album Detox, which is set to be released sometime this year.
This is like an Eminem song featuring Dr. Dre. Wicked video and Eminem's lines were fantastic in comparison to Dre's. I find that whenever there is another rapper on his tracks, Eminem usually makes them look bad. He's just that good I suppose.
Oh and I don't think Eminem should ever do a chorus again. His songs are way better when someone else (a female singer) is on the chorus alone.