Curved Air is a pioneering British progressive rock group formed in 1970 by musicians from mixed artistic backgrounds, including classical, folk, and electronic sound. Primarily active in the 1970s, and with occasional hiatuses, the band reformed in 2008. The band was, for a time in the 1970s, a sensation in the world of British progressive-rock because of Sonja Kristina's sensual vocals and Darryl Way's romantic violin. Kristina was a veteran of the London musical Hair in the late 60s.