Skiffle has an earlier history as well in America - it was one of the words meanin more or less the same as jug band. I seem to remember reading somewhere that if you needed to raise the rent, you might your friends together and make what music you could in a "skiffle party".

And that's where the word got taken from, when a word was needed for the interval music played by rhythm sections in a few trad jazz bands in England.

One skiffle group that made it pretty big were the Quarrymen in Liverpool. Grew into The Beatles, not at all a bad band. (Mind people have said they were a terrible skiffle group.)