Have a look here to begin with:- Na Connerys .
This is one of the 'big' sean-nos songs , which Frank Harte made into an English language version from a translation by Seamus Ennis.
The classic sean-nos performance is by Nioclas Toibin, but the singing of Frank Harte's English language version by Al O'Donnell is very powerful as well.
Brendan Kiely has written a book about the history of this song, and I am sure that there are a few people here who have a lot to add.