To Hear Your Banjo Play (1947)
Director: Irving Lerner, Willard Van Dyke 
Run time: 16:00 
Story & Dialogue written by Alan lomax 
with Woody Guthrie, Baldwin Haves, Sonny Terry, Brownee Mc Ghee, Texas Gladden 
Presents the origin of the banjo, the development of southern folk music and its influence upon Americans. Pete Seeger plays his banjo and narrates the story.
Dwnld + stream: 
http://www.archive.org/details/to_hear_your_banjo_play