Curved Air are a pioneering British progressive rock group formed in 1969.[1] The group evolved out of the band Sisyphus,[2] and was named after the piece "A Rainbow in Curved Air" by contemporary composer Terry Riley. The musicians came from quite different artistic backgrounds, classic, folk, and electronic sound, which resulted in a mixture of progressive rock, folk rock, and fusion with classical elements. Along with It's A Beautiful Day and East of Eden, Curved Air were one of the first rock bands to feature a violin.