Sorry, I can't help, but this request reminded me of one of my own:
I have a song called 'Louisiana' by Randy Newman (I think), which talks about 'five feet of water in the streets of Evangeline', and also mentions President Coolidge, which dates it fairly definitely.
Is this about the same topic as the musical? Can someone help with the historical background to the song? SuperSearch found many threads containing Louisiana, but not as a song title, it seems. Thanks, Susanne