From booklet (p. 37) to The Complete Hank Williams [10-CD edition] (Mercury, 1998):

"Fly Trouble" was released alongside one of Hank's most affecting ballads, "On the Banks of the Old Pontchartrain." Hank was weak at writing narrative verse, but he had acquired a poem from a woman in Louisiana, Kathleen Ramona Vincent, and set it to a very traditional-sounding melody. The result harked back to the origins of country music and was quite unlike anything else he ever commercially recorded. Rose's slick novelty ["Fly Trouble"] and the folk ballad were released together and became Hank's worst-selling single. In years to come, when someone would remark how well one of his records was selling, he would say, "Sure, am glad it ain't another damn 'Pontchartrain'.