Eminem & Royce Da 5'9" AKA: Bad Meets Evil, Royce being Bad and Shady being Evil. They preleased a small number of tracks such as "Scary Movies", "Nuttin' to Do" and "Bad Meets Evil", with the lattermost track featuring on The Slim Shady LP. The group was short-lived however, with an altercation occurring between Royce Da 5'9", and Eminem's clique; D12, prompting Eminem and Royce to cut off any connections.The group has since recovered their friendship. Royce & D12 have squashed their "beef" and Royce & Em are friends and recording music again.
BTW Check out Slaughterhouse.