I downloaded a song by searching for something like medieval chant and I found a song, mistitled as it turns out, and now I'm trying to find out who it's by. I've asked at a Gaelic forum,
here
Edit: song
here; Be warned, every time I try to play it, my browser shuts down. Maybe downloading it is OK.
The gaelic forum thinks they are saying this in one part:
Aréir id Deo
Chuaigh mé lei ar strae
Tar súil sí romham
Suas den tobar tú (or tobann)
Great song at least.