Uncle Dave was a real social change advocate. Bearing in mind, that he was singing to rednecked Southern Farmers in the 20's and 30's, It's a wonder he didn't get lynched. He was one brave man. For instance second verse to "Take me Back to Tulsa"

LITTLE BEE SUCKS THE BLOSSOM, BIG BEE GETS THE HONEY.
DARKY GROWS THE COTTON, WHITE MAN GETS THE MONEY.

Take me back to Tulsa, I'm too young to marry
Take me back to Tulsa, I'm too young to marry.

His son "Dorris" recalled that one opf Uncle Dave's Black Farmhands was about to have his own little farm, and home, foreclosed on by a bank. Uncle Dave Bought the Mortgage AND GAVE IT TO HIS FARMHAND.

His anti KKK verse, mentioned previously , was not an uncommon occurrance.
I can't understand him either.