Watch CineCalidad. THE GODFATHER OF BRITISH BLUES: The film biography features contributions from John Mayall himself, his family, fellow musicians, colleagues and friends, in interviews and performances. Rare archival film from all periods of his career marks his achievements and some of the events that formed them. THE TURING POINT: The earliest 'rockumentary' of John Mayall and his musicians filmed in their homes, dressing rooms, mororways, airports, clubs, concert halls and at festivals.