In 1950-51, there was a production of something called "The Dark of the Moon" in Cambridge (Mass). I think they did it in New York, later. It was a foggy, misty sort of play with music, built on a version of "Barbara Allen". But I never seen or heard that version anywhere else. Imperfectly remembered, here's a bit:

The witch-boy to the mountain came
A-pinin' to be human,
For he had seen the fairest one,
The dark-eyed Barb'ry Allen.

Oh, conjure-man, o conjure-man,
Please do this thing, I'm wantin'
Turn me into a human man,
For Barb'ry I'd be courtin'.

Does anybody know? Did they make that version themselves?