When the French Canadians (those from the Gaspe and N New Brunswick Areas (The area of LE "Acadee") left en masse from Acadia and settled in the tidewater Louisiana area, they brought theirAcadian ( "cajun" ) music that was the root of Zydeco. The Cajun music used fiddles as a central instrument. AS time moved on and Cajun music blended with the Creole sounds of the Islands(the black slaves had their own styles of music and the black slaves often ran into the swamps and met up with the CAjuns), The music evolved into a unique style where the Accordian or button concertina became the central instrument and the BEAT became central point.
I recall (I used to live down in NAWLINS) that the root name of Zydeco was the word Zaricot which is a "runner bean or butter bean" . The music is much livelier than traditional Acadee sounds and uses a heavy backbeat in fast waltz or 2/4 time. IT IS meant to dance to and we would go
"many time Fe- do -do off in de swamp yeh"
Those were some of the best times. Me an Mrs F got to know the "Coonaz" folks and , like the movie Southern Comfort, they just want be left alone.
I got to know some ole boys that worked on the rigs where I worked and they made me drink Jax beer and eat crawdads (our mudbugs) and nutria. All the time somebody would bring an accorion and a washboard and somebody'd sing **** that I could never understand anyway.(Funny thing about the rig guys, nobody was a driller, all these guys were either welders or divers)