Helped by his association with '' The Guardian '' , Cannon was able to contribute more substantial articles to the '' Los Angeles Times '' and the '' Chicago Sun-Times '' , and to underground magazines such as '' Creem '' . He wrote the 1970 documentary film '' London Rock '' , focusing on the UK 's counterculture movement . He recalls that , together with '' Rolling Stone '' journalists David Dalton and Jonathan Cott , he joined Granada Television documentary-makers such as Jo Durden-Smith , John Sheppard and Michael Darlow in devising " prime-time networked shows designed as anthems of the revolution " . Among these late-1960s projects , he says that the '' Johnny Cash at San Quentin '' TV special was his idea , and he " share s credit " for the ideas behind the concert films '' The Doors Are Open '' and '' The Stones in the Park '' . He also directed the film of Frank Zappa 's performance at the 1970 Palermo Pop Festival , for RAI , Italy 's national public broadcaster
The Stones in the Park
The Stones in the Park
Geoffrey Cannon