Captain Beyond is an American rock supergroup formed in Los Angeles in 1971. Consisting of former Deep Purple singer Rod Evans, former Johnny Winter drummer Bobby Caldwell, former Iron Butterfly guitarist Larry Reinhardt and former Iron Butterfly bassist Lee Dorman, the band had an eclectic style bridging elements of hard rock, progressive rock and jazz fusion with space rock. They released three albums between 1972 and 1977.

Deep Purple are an English rock band formed in London in 1968. They are considered to be among the pioneers of heavy metal and modern hard rock, although their musical style has varied throughout their career. Originally formed as a psychedelic rock and progressive rock band, they shifted to a heavier sound with their 1970 album Deep Purple in Rock. Deep Purple, together with Led Zeppelin and Black Sabbath, have been referred to as the "unholy trinity of British hard rock and heavy metal in the early to mid-seventies". They were listed in the 1975 Guinness Book of World Records as "the globe's loudest band" for a 1972 concert at London's Rainbow Theatre and have sold over 100 million records worldwide.