The Delmore Brothers were country music's first major brothers act. They were stars of the Grand Ol' Opry way back in the 1930s when the Louvins and the Stanleys were still in short trousers and the Everlys were still a few years off arriving.
Both the Louvins and the Everlys subsequently covered their "Blues Stay Away From Me", as did just about everybody else - everybody apart from reggae artists, that is, otherwise I'd have saved it up for a Single Song Sunday. Anyway, here's the original.
"Blues Stay Away From Me" - The Delmore Brothers
"Field Hand Man" - The Delmore Brothers