Four CD set celebrating the so-called "underground" rock music. 1971 was a momentous year in rock and one which would continue to see Progressive music in all it's forms become a dominating force with the album buying public. Much of this music appeared on the "progressive" imprints of major record labels such as EMI's Harvest, Decca's Deram and Philips Records' Vertigo and emerging independent labels such as Charisma, United Artists and Island and led to an increasing presence of underground album music on BBC Radio 1 on it's Sounds Of The Seventies and Top Gear programs. Breakthrough - Underground Sounds Of 1971' is a lovingly compiled collection from this pivotal year in music, featuring a host of key artists plus a host of lesser-known acts who failed to reach a wider audience but produced a wide breadth of music, such as Bb Blunder, Big Sleep, Cressida, Help Yourself, Mighty Baby, Patto, Pink Fairies, Samurai, Colin Scot, Spring and Stray. Turn on and tune in to the gloriously diverse underground sounds of 1971. Includes An Illustrated Booklet With Essay By Mark Powell.