I'm not 100% Irish, but I'm Irish enough to favor sad songs. This is one of the saddest. I used to play and sing it myself, before an unfortunate partial finger amputation.
I'd be surprised if Toussaint made two nickels on this song when it was released. Maybe it charted regionally, but I doubt if it had any national traction. It was elevated to the national consciousness by being included in the soundtrack of the movie "Hairspray." So here's a shout out to John Waters for that. Mr. Waters, and Robert Rodriguez and Quentin Tarantino too, do us a favor and do the songs a service by reminding us how great they are.