this is why I said it sounded cajun http://www.youtube.com/watch?v=DRxJow0jOrI&list=PL70EAD8D5981589D8 The song is officially German and is called "Hiss - TANZ" and after some checking it may be that there is a heavy German influence in the Cajun music I have heard. Turns out the most prized accordions in that are the German. However I doubt the Germans play the washboard, I could be wrong. We've been getting educated since I posted this. Getting more info on this all the time from the great responses. Turns out this dance style is called Strumpfhosentanz and if you do a google search of that and hit videos you can find other videos of people doing it. I still think these girls did it best though.