Before defining the Folksong (how much time can you spare?)
you should define Folk. And you ain't got enough time to start on that hoary old chestnut.

I think we can take the essence from another hoary old chestnut. "I don't know much about art, but I know what I like"

does that help?

and another hoary chestnut "Are we there yet?"

Or should I have started by defining "rhetoric?"