Joel and Ethan Coen's new movie about the Greenwich Village folk scene of the early 1960s, Inside Llewyn Davis, is loosely based on the life of Dave Van Ronk. The New York Times has an article about the connections:
For a Village Troubadour, a Late Encore: The Singer Who Inspired Coen Brothers’ New Film
ML420.V37 M3 2005).
We also have CDs by Van Ronk, including Inside Dave Van Ronk (CD 11978), that inspired the Coen brothers' movie title, and two method books on fingerstyle guitar.