The John and Ruby Lomax 1939 Southern States Recording Trip, discs 2596, 2597, 2998 & 2599. 1939. (on mp3, from the Library of Congress website)
Recordings of convicts in a Texas prison. Ace Johnson plays harmonica (“Mama Don’t ‘Low No Swingin’ Out in Here,” “Train“), Smith Casey and Jesse Lockett play guitar and sing, and of course there are a number of work songs. It’s mostly unremarkable, compared to Alan Lomax’s 1959 prison recordings, and there seem to be technical difficulties going on.