Someone on Instagram said Bruce got the idea for the song based on the 1956 movie The Rainmaker.
Based on the synopsis and after reading the lyrics, plus Bruce’s love for old movies, sounds feasible.
The poster also added a comment about the movie made in vista-vision (are there tainted women in the movie???), as well as a political comment that cannot be repeated....
Synopsis of the movie for those (like myself) who are not familiar:
During the Great Depression, a drought is wreaking havoc on a small, destitute Kansas town. Bill Starbuck (Burt Lancaster), a slick grifter, arrives in town, promising he can make it rain in exchange for $100. His offer is accepted by H. C. Curry (Cameron Prudhomme), a rancher whose spinster daughter, Lizzie (Katharine Hepburn), is desperate for a suitor. Lizzie finally finds confidence when Starbuck, ever the smooth talker, convinces her she's beautiful.