That song...
Iarla O Lionaird singing Casadh an Tsúgáin/Frankie's Song was incredibly moving.
shareTrue, Iarla O Lionaird's a great singer, and it's one of the most beautiful of the traditional Irish songs I've heard.
I don't know the singers name, but there's another great version of the same song on The Chieftain's Water from the Well album.