Murray Lerner's documentary features Bob Dylan's performances at the Newport folk festival between 1963 and 1965 - the time when Dylan changed the music of the world and changed himself from the fresh-faced cherub singing Blowin' in the Wind to the rock 'n' roll shaman who blew pop music apart when he went electric.The film No Direction Home told the story of how Dylan affected the world and the world affected Dylan, but this film brings you face to face with the work itself. Like the discovery of a hitherto unknown manuscript or an unseen masterpiece, this is a treasure trove, newly opened up.