Insane Clown Posse, often abbreviated as ICP, is an American hip hop duo. Formed in Detroit in 1989, ICP's best-known lineup consists of rappers Violent J and Shaggy 2 Dope. Insane Clown Posse performs a style of hardcore hip hop known as horrorcore and is known for its elaborate live performances. The duo has earned two platinum and five gold albums. According to Nielsen SoundScan, the entire catalog of the group had sold 6.5 million units in the United States and Canada as of April 2007. The group has established a dedicated following called Juggalos numbering in the "tens of thousands".