Hmm. Very interesting. I happen to have been talking to Sydney Carter's son Mike Carter, recently, and he accepts (if I understand him correctly) that the tune is traditional. Which may add some credibility to the Dutch theory of origin.

And since lots of people remember that there was a hymn before Flatley, the $64,000 question must be, if you were John Doe and just heard of Flatley's show by name, would you have expected there to be some connection with the hymn?