Ran across this piece of history by Western swing man Adolph Hofner. To quote a Texas Monthly story from 2000 about him:
Here’s the true sound of the South and Central Texas dance hall. Adolph Hofner, born in 1916 in the predominantly Czech community of Moulton and based mainly in San Antonio since the thirties, recorded Western swing and its variants for several national labels starting in 1938. But he was best known in the Hill Country and the Valley as a tireless performer who knew exactly what the people wanted come Saturday night.
The notes provided with the music on YouTube say he claimed to be the first to record the Cotton-Eyed Joe. 😉