There is wrock. There is trock. There is filk of every flavour.
But until now, the world has never contained anything as awesome as
A Sorry Box and a Hillside. It's folk written like folk, like honest-to-god English folk ballads, about the Lone Centurion. (And if you don't know who that is, you're either not a Doctor Who fan, or you're a Doctor Who fan who isn't going to to want to be horribley spoilered by clicking that link.) And then - and this is the important bit - the creator PREFORMS the ballads and analyses them in straight-faced academic style.
Who IS the man on the hillside?
He's King Arthur! He's Merlin! He's been bewitched by the fairy queen like Tam Lin and Thomas the Rhymer (this one seems unlikely to me because then surely there'd be that ballad? Where a lot more happens?) He's a metaphor for Jesus! (They're all metaphors for Jesus.) He is actually a woman, see the last bit of the ladyversion, and she's cursed to her vigil because she transgressed gender roles! He's the monarchy, and it's actually from the Glorious Revolution, and it's a metaphor for how terribly Oliver Cromwell is treating the country!
My tiny inner Doctor Who fan and my tiny inner medieval historian are doing a giddy little dance together right now, FYI.