"2000 B.C." featured the first collaboration between Canibus and Kurupt, Ras Kass and Killah Priest, a rap supergroup collectively known as The HRSMN (referring to the Four Horsemen of the Apocalypse), on the track "Horsementality". Though following "2000 B.C."'s release it had been announced that the group would be releasing an album, these plans never materialized, with only an EP of outtakes from 2001 entitled "The Horsemen Project" released by Killah Priest's management in 2003. Since 2000, however, the members of the group have worked together on various songs and rumors of a full-length HRSMN album have persisted and include speculation about collaborations with Pharoahe Monch, Common and Rakim, among others.