Between March 31, 1939 and June 14, 1939 John Avery Lomax and his [bad word] Terrill Lomax recorded approximately 25 hours of folk music (from more than 300 performers) in their "Southern States Recording Trip" for the US Library of Congress. This is one of the original recordings of "Rock Island Line", which later became famous through singers like Kelly Pace, Leadbelly, and Lonnie Donegan.