The Delmore Brothers

Alton Delmore (December 25, 1908 – June 8, 1964) and Rabon Delmore (December 3, 1916 – December 4, 1952), billed as The Delmore Brothers, were country music pioneers and stars of the Grand Ole Opry in the 1930s. The Delmore Brothers, together with other brother duets such as the Louvin Brothers, the Blue Sky Boys, the Monroe Brothers (Birch, Charlie and Bill Monroe), the McGee Brothers, and The Stanley Brothers, had a profound impact on the history of country music and American popular music.

source: Wikipedia