Oh, my God, now I've seen everything!! They made a SWING VERSION of "Cailín Deas Crúite na mBó" for the movie Little Nelly Kelly. Joe, I went to the webpage you referred to, and they quoted Judy Garland as saying, "an obscure Irish folk song" that they used in the picture continued to be an obscure Irish folk song. Roger Edens re-arranged it, and she sang one verse in the film.
alice