I was alerted to the publication OTHERWORLD on the excellent TAIRIS blog. It's a collection of Irish songs of the Otherworld realms on a CD (sample above) which comes as part of a definitive book on the subject reviewed HERE
It seems to me indispensable. And if you buy it from Kenny's of Galway it's cheaper than Amazon:
http://www.bookshop.kennys.ie/book/IE/9780956562838/The_Otherworld_Music__Song_from_Irish_Tradition
