What is the first R and B song?

The origins of R&B can be traced back to the 1940s, but one of the first songs to be labeled as Rhythm and Blues is "Caldonia" by Louis Jordan, released in 1945. This song blended jazz, blues, and swing elements, setting the stage for the genre's evolution. R&B later became more defined in the 1950s and 1960s with artists like ray Charles and Sam Cooke.