The roots of Country Music go way back, to an era before popular music had branched into clearly distinguishable styles. Some say that this is the first Rock 'n Roll song; while that's almost certainly not true, you can hear rhythms that would appear in early Rock and especially in Rockabilly.
This record was released in 1946, a decade before Elvis.
The Delmore Brothers started recording in the 1920s and were regulars at the Grand Ole Opry in the 1930s, ultimately writing over a thousand songs during their career. Rabin Delmore died in the early 1950s, when he was in his early 30s. His brother Alton lived another decade, also dying young. You wonder what they would have done had they had more time to write more songs during the time when music was evolving at a breakneak pace.