Jo Sago was the second and final album by the British trio from Birmingham, comprising James Langston (lead vocals, guitar, percussion), Jeff Daw (guitar, bass, percussion, flute, vocals) and the multi-instrumentalist Bob Wilson (piano, organ, harpsichord, guitar, bass, percussion, vocals), who replaced Nigel Phillips. Although the previous album An Asylum For The Musically Insane had failed to achieve commercial success, EMI Harvest continued to back the band and enabled them to produce a second LP. The concept album, which deals with themes such as ethnic tensions in Britain, was recorded in 1970 at Sound Techniques Studio and produced by Tony Cox with Vic Gamm as sound engineer.

Nigel Phillips, who had already left the band, and additional bassist Mick Hincks, a former member of the bands Locomotive and The Dog That Bit People, supported the trio as guest musicians. They are both pictured on the gatefold cover of the album, released in November 1970 on the legendary Harvest label. The LP features a spoken narrative, accompanied by psychedelic folk and progressive rock, telling the story of a fictional character from the West Indies. It is just as unconventional and experimental as its predecessor, which was also a commercial failure despite rave reviews in the underground press. The record company therefore terminated the contract and the band split up at the end of 1971. This is one of the most obscure rock albums and, as an original Harvest LP, it is now a genuine rarity that fetches considerable sums.