Founded by Tim Booth and Ivan Pawle in Dublin in 1967, Humphrey Weightman (guitar) played with them for their first show, in October 1967. [a=Brian Trench] (keyboards, vocals) played shows through 1968 until multi-instrumentalist Tim Goulding joined. Caroline "[a=Linus (15)]" Greville (percussion/vocals) was a member 1968-69. Gary Moore often augmented the band live on various instruments 1968-69, and also played lead guitar on the second album, in 1970. Drummer Neil Hopwood joined in 1970. Goulding left in early 1971, replaced by Gay Woods and Terry Woods for a 6-week European tour, after which the group dissolved.

Tim Booth led a new lineup through 1973. All other reunion lineups have have included [a=Tim Booth (2)], Tim Goulding, Ivan Pawle, and - since 1980 - [a=Joe Thoma], sometimes augmented by other players as well.