Who, other than Royce da 5'9", was also on the Rock City track and part of Bad Meets Evil?
Rock City (song):  The song also features vocals from rapper Eminem, becoming Eminem's debut appearance on one of Royce's solo albums. Bad Meets Evil: Bad Meets Evil is an American hip hop duo composed of Detroit-based rappers, Royce da 5'9" (Bad) and Eminem (Evil).
Eminem