I don't know enough about Sousa marches, but it's entirely possible that they lifted it from a piece of popular music from an earlier time. Sadie Green, the Vamp of New Orleans, is their interpretation of Sallie Green, the Vamp of the Town, which Billie Murray recorded in 1920 or 21. I think that there was a lot of influence from many early popular pieces that made their way into early blues and hillbilly music. A lot of that stuff is really square sounding though and people don't listen to it enough to really get familiar with it.