I was just listening to one of my Alan Stivell CD's and there are a few of his tracks which have an unusual melody and rhythm.

As Wiki says, "Alan Stivell is a French, Breton and Celtic musician and singer, songwriter, recording artist, and master of the Celtic harp. From the early 1970s, he revived global interest in the Celtic harp and Celtic music as part of world music."

I was thinking that a tune played by an Irish folk band in the 1980's doesn't preclude the possibility that it is not an Irish tune. It could be Breton, or from a number of different cultural sources.

I'm not saying that it is necessarily from Alan Stivell, but he and other folk musicians were sharing tunes from before the 1980's.