There's loads, btw, I'm a huge Em fan. These are just mine, so don't hate. I hope I don't offend.

2pac - Eminem

2pac - Dr. Dre

2pac - Biggie

Eminem - Bizarre

Eminem - Dr Dre

Eminem - Mobb Deep

Ludacris - Xzibit

Mobb Deep - Nas


Probably others, but can't think right now