rising sun blues

I need to know more about Alan Lomax, folklorist and ethnomusicologist. Listen to interviews with him and his biographers, as well as excerpts from his recordings, on NPR. He travelled the world recording folk songs and talking to folk singers. I especially love his early recordings of blues singers in the South. In 1937 he recorded "House of the Rising Sun", sung by 16 year old Georgia Turner on the street. And, you know "Po Lazarus", which the chain gang sings in O Brother Where Art Thou? He recorded that, in Mississippi State Penitentiary, in 1959. Its just so interesting.