I've just returned from a concert with Chris Wood, Andy Cutting, Karen Tweed and Ian Carr. They played a set of English dance tunes which Chris introduced as, "..some from then and some from now" It really does cloud the issue as soon as we start attaching words like 'folk' and 'traditional'. I'm friendly with some shepherds from Northumberland who play tunes - some that they've written and some that they haven't. I don't recall them ever calling one of the tunes folk or traditional.