Atomic Rooster are a British rock band originally formed by members of The Crazy World of Arthur Brown, organist Vincent Crane and drummer Carl Palmer. Their history is defined by two periods: the early-mid-1970s and the early 1980s. The band went through radical style changes, but they are best known for the hard, progressive rock sound of their hit singles, "Tomorrow Night" and "Devil's Answer", both in 1971.

The Crazy World of Arthur Brown are an English rock band formed by singer Arthur Brown in 1967. The original band included Vincent Crane, Drachen Theaker (drums), and Nick Greenwood (bass). This early incarnation were noted for Crane's organ and brass arrangements and Brown's powerful, wide-ranging operatic voice. Brown was also notable for his unique stage persona such as extreme facepaint and burning helmet.