"Pat and I recorded this from blind Travelling woman, Mary Delaney in the 1970s"

And thanks for linking that magnificent performance, Jim - though I had heard it before. Like Nick, I think Lankum do it justice, and you might be surprised how far it has spread from that one recording. I've heard several US performers (including the Foghorn String Band of all people) sing it, possibly inspired by Cathy Jordan, who has taught it at Appalachian summer schools. Peta Webb and Ken Hall do a really nice harmony version, and just last week I heard Sam Baxter, a very talented 20-year-old singer and musician here in Glossop, finish his support set to Martin Carthy with it. The interesting thing is that none of those people use any instrumental accompaniment, and all sing it in pretty much the same free timing as Mary Delaney. It doesn't seem to have been 'folk-revival-processed'!