"I question the claim that the broadside version of the Demon Lover is definitely the first - the story is quite popular as ain international tale"

I did wonder at one point whether the seven familiar verses from 'A Warning for Married Women' might have been part of an earlier undetected version around which Laurence Price erected a massive scaffolding of unneccessary verbiage, but there's no evidence for that.

'Hind Horn' is one that did exist as a medieval romance, and harks in one respect back to the Odyssey. But that kind of reworking of an older tale suggests to me a poet's hand (just as Shakespeare rehashed older plots) more than anything.

'Golden Vanity - was the broadside definitely the original?'

I don't know - I just used it as an example of an older broadside that reads very much like the sung versions.