Zydeco isn't Cajun. They both utilize accordians but Zydeco is traditionally more bluesy & R&B influenced and it's practitioners such as Clifton Chenier, Buckwheat Zydeco, C.J. Chenier, etc. are usually black. Cajun is more country influenced with fiddle being a primary instruments, much more so than in Zydeco, and it's practitioners such as Michael Doucet, Dewey Balfa, The Red Stick Ramblers, etc., are usually white.
I love this whole series, even if you do use a few circular answers to pad it out occasionally. The questions are truly eclectic, but it helps when you see a question that you just answered the other way around in a previous quiz