South west Louisiana and South east Louisiana are two seperate animals when it comes to the radio on this
, and not too sure on the Southwest Louisiana part.
Basically Swamp pop has been a format that was either played in addition to the current playlist of country music (such as what was done on KQKI- Bayou Vista) or has had it's own Saturday/Sunday morning show for about 20 years as much as I can remember (KCIL-Houma and WYPY-Baton Rouge)
Some of the swamp pop songs were heard on top 40 stations in the 1950s and 1960s, so some of those songs were added to oldies stations such as Kool 95.7.
But as far as I know the run down if I remember is this:
Truck owned KLRZ and didn't want to air another country format, so he ran the top 40 and classic rock with not much success, while looking for something interesting, he came across Ruth Ann Marx station in Mamou that played everything. Knowing the people who listened to the early morning shows on the country stations he developed the format pretty much from KBON's original idea. (there was a local Daily Comet/Courier story about this about 5 years ago.. But I lost my copy of the story)
It became more successful than the other formats and he bought KLEB when it came up for sale from the Callais family who I've heard aired Cajun and country also as well as KANE in New Iberia (Truck also owns a business radio repair business hince his first IDs as coming from the EUI telecommunications Empire... Electronics Unlimited) . KMRC went through a few owners in Morgan City before being bought by a company called Spotlight. The classic rock format that aired didn't do nothing at all, so they stole Truck's idea and aired swamp pop. they are the same people who own KAGY down in Buras, and I can't remember which one came first but one followed the other within the year.