The Best film on that era is this one by Alan Lomax;

Balllad, Blues, and Bluegrass

New Lost City Ramblers, Ernie Marrs, Roscoe Holcomb with John Cohen,
Clarence Ashley, Doc Watson, Clint Howard, and Fred Price, Ramblin' Jack Elliott, Jean Ritchie, Peter LaFarge, Memphis Slim and Willie Dixon, all at a party at Lomax's apartment in 1961.

Mark Ross