This movie is set during the period between Dylan first coming to New York and his going electric at the Newport Folk Festival in 1965, and concentrates on the love triangle between Dylan, Joan Baez, and a fictionalized version of his girlfriend, called Sylvia Russo here.
The music is great and the acting superb. Ed Norton as Pete Seeger does an especially good job, and I bet he will get an Oscar.
A warning: You won’t really know Dylan any better after you see this movie. He truly is A Complete Unknown.