Par DYLAN BOB. With a treasure of authentic and vintage footage, a host of characters including Pete Seeger, Allen Ginsberg and Mavis Staples, and in-depth conversation with Dylan himself, Scorsese's Grammy-winning documentary captured a turbulent period in the history of folk and rock music. Focusing upon the years between 1962 and 1966, Scorsese charts the struggles of the young, sophisticated a…