Originally called the Bakerloo Blues Line, Dave "Clem" Clempson, Terry Poole and Keith Baker released one album of blues rock for Harvest. Also of note was their "Drivin' Bachwards", an earlier version of Bach's Bourree in E minor than the more famous one recorded by Jethro Tull.
Originally the Stormsville Shakers, the band morphed into Circus when leader Phillip Goodhand-Tait left the band in 1969. They earned their stripes with a residency at the Marquee Club in Soho and providing a start for Mel Collins, undoubtedly the one of the star instrumentalists of the progressive era.
Formed in 1966 and known as 1-2-3, the members of Clouds were one of the first proponents of organ-driven rock and their residency at the Marquee Club influenced many would-be prog rockers. Their set included a cover of Paul Simon's "America", the arrangement Yes nicked for their version. Bassist Ian Ellis, keyboardist Billy Ritchie and drummer Harry Hughes changed their name to Clouds when they signed to Island Records in 1967.