The Prime Movers were an American blues band based in Ann Arbor, Michigan, United States, which was formed in 1965. The band originally consisted of Michael Erlewine, Dan Erlewine, Robert Sheff (keyboards), Robert Vinopal (bass), and Michael "Spider" Wynn (drums). Vinopal left soon after the band's formation and was replaced by Jack Dawson. Wynn left a short time later and was replaced by James Osterberg, who would later become famous as Iggy Pop. When he joined the Prime Movers Osterberg took the name "Iggy", from his previous band The Iguanas.