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 ?
Havoc (musician) Kejuan Muchita (born May 21, 1974), better known by his stage name Havoc, is an American rapper and record producer. He was one half of the hip-hop duo Mobb Deep.
Trackmasters The Trackmasters (also known as Poke & Tone) is an American hip hop production duo, composed of music producers Poke (Jean-Claude Olivier) and Tone (Samuel Barnes), best known for their commercial hit records in the late 1990s and early 2000s. Frank "Nitty" Pimentel joined forces with the duo to complete the success of "Trackmasters." Throughout their career they have worked with various hip-hop and R&B artists including Will Smith, R. Kelly, Nas, Jay-Z, Cam'ron, Jennifer Lopez, Mariah Carey, The Notorious B.I.G. and 50 Cent.