UGK (short for Underground Kingz) was an American hip hop duo from Port Arthur, Texas, formed in 1987, by the late Chad "Pimp C" Butler. He was then joined by Bernard "Bun B" Freeman, who became his longtime collaborator. They released their first major-label album Too Hard to Swallow, in 1992, followed by several other albums charting on the Billboard 200 and Top R&B/Hip-Hop Albums charts, including the self-titled Underground Kingz album, which debuted at number one on the Billboard 200, in August 2007. The duo has also been featured on hit singles by several other artists, such as on "Big Pimpin'" by Jay-Z and "Sippin' on Some Syrup" by Three 6 Mafia. Pimp C founded UGK Records in late 2005. On December 4, 2007, Pimp C was found dead in a West Hollywood, California hotel room.