May I echo that Joe.
Thanks to Rickard Sjöberg for posing us an interesting question. Thanks to Richard G Mitchell for giving us a definitive answer.
If Rickard had just sent an e-mail direct, we would not have ever read Richard's explanation.
It's nice to know that someone out there has enough respect for historical song that they actually take the trouble to make their new stuff fit.
I will look forward to seeing the film.
Quack!
GtD.