This is getting to be a St. Patrick's Day tradition

I don't like all the stuff the Celtic Women do, and lord knows they've done enough over-produced schlock.  But this, just four voices, no instruments, pure harmony, unbelievable tune....

It still gives me shivers up my spine every time I hear it.

"But Dave, how do you know it's really Irish?"  Because I can't think of any other nation that would sing about a lover kneeling and praying the Ave Maria over his dear love's grave, and make it sound as sweet.