British progressive rock, founding members were from the Yardbirds. they added Annie Haslam in the 70s...from Wikipedia:
In January 1969, former
Yardbirds members
Keith Relf and
Jim McCarty organised a new group devoted to experimentation between rock, folk, and classical forms. This quintet—Relf on guitar and vocals, McCarty on drums, plus bassist Cennamo, pianist Hawken, and Relf's sister Jane as an additional vocalist—released a pair of albums on
Elektra (US) and
Island (UK-ILPS 9112), the first one, titled simply
Renaissance, being produced by fellow ex-Yardbird
Paul Samwell-Smith.