I was just about to say this after reading Jack Campin's post and then found your post, but I'll say it anyway.
As I said earlier, ""The tune vaguely sounds like the chorus of "Brother Can You Spare a Dime?" to me. Could be totally wrong of course."
It only reminded me of that song because when I listened to the MIDI file I could hear the the word "once" in my head and a bit of a melody and then I had to do the old memory trick to identify that tune. Then on reading a bit of information about the Brother tune I found that it is supposedly based on the same tune as the Israeli national anthem so then the search led down a completely different path.
I was also thinking that it might be useful if someone knows how to convert a MIDI file to ABC notation because then we could post that here and more people could possibly identify the tune. Unfortunately I don't know how to convert it to ABC. There may be an ABC wizard here who knows the trick(s), hopefully a MIDI to ABC converter somewhere online.
I have to say that the last country of origin I would have thought of is Ireland but that might be the clue we needed.
And, in case you didn't know, one of Mudcat's key aims is to help people to get a lot of air miles from their spouse, so we are at your service.