The Twa Corbies link that Mary of Kentucky gave to Lesley's site leads to the An Alarc'h tune, or a version of it; it may be a little over-arranged, as it's difficult to separate the melody-line.  I've tried Jeri's .ABC and it plays more-or-less as gibberish for me, but that could be AbcMus misbehaving!  Ed Pellow makes some good points about Tim Van Eyken's notes: I was tempted earlier to suggest that they were fanciful nonsense, but thought better of it...

Malcolm