This beef is mainly between Dr Dre and Jermaine Dupri, but Eminem has stuck up for Dre, and along with Xzibit, joined the beef against J.D.  It all started when J.D claimed that he was the best producer in the game, claiming he was better than Dre  and Timbaland during an interview with XXL magazine.  Dre retaliated in the B-Side of Eminems Without Me single, "Say What You Say" saying: 
          "Been here longer than anyone in the game And I ain't got to lie about my age (But what about Jermaine?) Fuck Jermaine! He don't belong speakin mine or Timbaland's name And don't think, I don't read your lil' interviews, and see what you're sayin I'm a giant, and I ain't gotta move 'til I'm provoked When I see you I'ma step on you and not even know it You midget, Mini-Me with a bunch of little Mini-Yous runnin around your backyard swimmin pools Over 80 million records sold And I ain't have to do it with ten or eleven-year-olds."

Eminem and Xzibit dropped a freestyle going at the SoSo producer/rapper which appeared  on the DJ KaySlay mixtape titled "Say What You Say".