An English progressive rock band formed in 1969 by former Yardbirds members Keith Relf and Jim McCarty as an experimentation between rock, folk and classical forms. The first lineup also included bassist Louis Cennamo, pianist John Hawken and Relf's sister Jane as an additional vocalist and released 2 albums on Elektra and Island. By 1970 the band had broken up with Relf and McCarty quitting performing and Cennamo joining Colsseum. Hawken then formed a new band with Jane Relf and members of his former band, the Nashville Teens. There then followed several personnel changes before the most stable incarnation was put together in 1971 with Annie Haslam on vocals.