What Scoville said.

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Here's some info from http://en.wikipedia.org/wiki/Music_of_Louisiana

..."Acadiana music
Acadiana has five main musical genres - Cajun music, Creole music, swamp blues, swamp pop, and zydeco. These historically-rooted genres, with unique rhythms and personalities, have been transformed with modern sounds and instruments.

Swamp pop

Main article: Swamp pop
Swamp pop came about in the mid 1950s. With the Cajun dance and musical conventions in mind, nationally popular rock, pop, country, and R&B songs were re-recorded, sometimes in French. Swamp Pop is more of a combination of many influences, and the bridge between Zydeco, New Orleans second line, and rock and roll. The song structure is pure rock and roll, the rhythms are distinctly New Orleans based, the chord changes, vocals and inflections are R&B influenced, and the lyrics are sometimes French.

Swamp blues

Main article: Swamp blues
A sparse but funky sub-genre of blues that flourished in the 1960s, swamp blues was centered in Crowley, Louisiana — home of Jay Miller's Excello Records, which recorded Louisiana-based swamp blues acts including Slim Harpo, Lazy Lester, Lightinin' Slim, and Katie Webster"...