Luniz are a rap duo out of Oakland consisting of Yukmouth and Knumskull, two friends who have known each other since junior high. Originally calling themselves Luni Tunz, the two gained fame after six years together when they appeared on Dru Down's Explicit Game album. Their debut album, Operation Stackola, was released in 1995 and knocked Michael Jackson's HIStory off the top of the R&B charts on the strength of the hit single "I Got 5 on It," which featured guest vocals by Michael Marshall of the Timex Social Club. Luniz lyrics take novel, comic approaches to sex, drugs, and everyday occurrences. Their second album Lunitik Muzik followed in 1997. ~ Steve Huey, All Music Guide