"The Woods of Truagh" sung unaccompanied by Matthew Byrne https://www.youtube.com/watch?v=7t5vfoF5KnI

Nutty's link, early on in this discussion, to another song "The Green Woods of Truagh", is not working now. But you can find instrumental recordings of the melody on youtube, and Ethna Carberry's words are posted in this discussion (I haven't tried to fit the tune and lyrics together to see whether they work well).