Well, I raised the question last night with a dozen folks through the evening at the "family table" in my favorite Italian restaurant. The group was comprised of people with a mix of ethnic backgrounds, and half of them were native Italians with as yet limited English. They all mentioned "Danny Boy" & "Molly Malone". Three of them also mentioned "Irish Washerwoman", but didn't know the name and had to sing a few bars. And there was a different set of three who similarly mentioned "Garryowen". One of them referred to it as "that cavalry song".