UGK (aka Underground Kingz) are Houston-based MCs Bun-B and Pimp-C. Along with the Geto Boys, the duo are considered key figures in the rise of Houston rap in the late 1980s. Although their lyrics cover fairly typical gangsta rap terrain, the UGK's association with the Screwed Up Click put them at the fore of the then obscure Chopped & Screwed movement. The duo has also guested on classic tracks like Jay-Z's "Big Pimpin'" and Three 6 Mafia's iconic "Sippin on Some Sizzurp." Bun-B and Pimp-C have both released successful solo albums in the new millennium.