Film-makers David Hoffmann and Harry Wiland were allowed into New Yorks notorious Sing Sing prison, not just to make a film themselves, but to teach film-craft to some of the inmates. This relationship developed to such an extent that, encouraged by the prisoners, they persuaded the Department of Correction to allow the Thanksgiving Concert which is the subject of this film. Many acts were approached to take part, and most refused, but Blues legend B.B. King and veteran folk singer and activist Joan Baez recognised the importance of the venture, and with enthusiastic support from The Voices Of East Harlem, comedian Jimmy Walker and performances from a few of Sing Sings inmates, a unique and never-to-beforgotten show was staged. This video is not just the film of an extraordinary concert however, it is also a touching and enlightening documentary about the creation, production and filming of that concert, and equally works as a revealing tale of American prison life in the early 1970s.