While we are on this subject as well as saying that he saw the television news 3 1/2 hours after the Fitz sank Gord has been saying the tune he used was an "old Irish dirge".
As in an article that Char recently highlighted at:-
http://www.irishcentral.com/IrishAme...103052314.html
"The song proved so evocative that Irish singer-songwriter Christy Moore used Lightfoot’s melody when he recorded the song “Back Home in Derry"
I suspect that this has been displayed here before but here is Christy Moore singing this particularly evocative "dirge"