I was watching the 2012.03.08 The Colbert Report on the Canuck Comedy Channel website just now. The guests were three big names in music and one guy is in charge of the Andy Lomax archives. He play a snippet of a recording of Jean Ritchie Lomax made (1959 I think) and then one of Dylan's adaptaion of that into The Masters of War.

Long story short... check this out.