Was (Not Was) is an American pop rock group founded in 1979 in Detroit, Michigan, by David Weiss and Don Fagenson, who adopted the stage names David Was and Don Was. Their song catalog features an eclectic mix of pop and rock styles, often featuring guest musicians from across the musical spectrum. The band's most popular period was during the 1980s and early 1990s, with their highest-charting hit, the song "Walk the Dinosaur", released in 1987 as the lead single from their 1988 album What Up, Dog?, becoming a worldwide top-40 hit and peaking at No. 7 on the Billboard Hot 100 singles chart. The band went on indefinite hiatus in the mid-1990s, but has returned sporadically since the turn of the millennium. Their most recent release was the 2008 album Boo!.