Sing a Country Song

Sing a Country Song is a 1973 musical documentary that was directed by Jack McCallum. The film, edited by Verna Fields, consisted of performances and interviews with country singers Billy Joe Shaver, Duane Eddy, Tex Ritter, Sonny Curtis, Red Steagall, and others. It was filmed in Los Angeles and Nashville.

Synopsis from Wikipedia, CC BY-SA 4.0. Everything below written here.