Blue Cheer is an American blues rock group of the late 1960s and early 1970s, who helped to pioneer heavy metal music. Based in San Francisco, original personnel were singer/bassist Dickie Peterson, guitarist Leigh Stephens, and drummer Paul Whaley. A power trio, the band was named after a variety of LSD promoted by underground chemist and Grateful Dead backer Owsley Stanley. This variety of LSD took its name from a popular laundry detergent. Their first hit was a cover version of Eddie Cochran's "Summertime Blues" from their debut album Vincebus Eruptum (1968).