Yo, I did a quick bit o' lookin', and this came up in an earlier thread, and Dale Rose, God bless 'im, provided a link to a good definition of Zydeco.

Although I especially like Spaw's definition from that thread: "One part Basin Street, one part jug band, one part 50's rock, one part Dixieland, six parts Cajun, with a dash of reggae."

Chris