just did a web search on Dream Angus, though I only looked at the first couple of pages of results. I see it has also been sung by Annie Lennox.
for the tune (though I didn't listen to any)
mp3 Kaye: www.polopop.com/kaye/sleEP/dreamangus/
real audio Elspeth Cowie; http://www.footstompin.com/music/scottish_song/naked_voice/tracks/obj701
score based on Dream Angus; http://fagus-music.members.easyspace.com/composers/geaac/ga_da.htm