Thanks Shaneo. I was just confused because bubblyrat said

I seem to remember that there was a rather nice tribute "Lament " with lovely words, on the Dubliners 25 th anniversary double cassette ( long since lost,I fear !! ) -----Did you write that ???

and LukeKellylives (Chris) replied:

Yeah, I did. I've written a lot about Luke. Truly a legend.

Which made me think LukeKellylives (Chris) was claiming authorship of the Michael O'Caoimh song.