Question: What duo  was an American rapper and record producer apart of , who had a guest appearance in  the second album by American hip hop duo 1982 ?
Sentence (from "2012 (1982 album)"): Guest appearances include Mac Miller, Bun B, Shawn Stockman (of Boyz II Men), Roc Marciano, Havoc (of Mobb Deep), Freddie Gibbs, Crooked I and Lil' Fame (of M.O.P).
Relevant evidence: No