The group originally featured lead vocalist Kevin Ayers, lead guitarist and co-lead vocalist Brian Hopper, rhythm guitarist and vocalist Richard Sinclair, bassist Hugh Hopper and drummer Robert Wyatt. They had several line-up changes during their existence, and despite not releasing any material during their brief three-year tenure, the band are the originators of the Canterbury scene : after their breakup in 1969, the group's members went on to form key bands within the scene, Soft Machine, and Caravan.