Ok, I'm about to really stir up a hornets nest here, but this came up in another thread (or a hundred or so of them I'm sure.)

We debate about what is folk music. And nearly anyone will admit that it's nearly impossibly to define.

So, what are your thoughts on the subject?

And is something that isn't folk music today (Brittney Spears???) going to turn into folk in 50 years?