Angels we have heard on high
Sweetly singing o’er the plains,
And the mountains in reply
Echoing their joyous strains.
Gloria, in excelsis Deo!
Gloria, in excelsis Deo! — Traditional French Carol, translated by James Chadwick
More lyrics: http://cyberhymnal.org/htm/a/n/angelswe.htm
“Angels We Have Heard on High” is sung in this video clip from Christmas Celtic Sojurn 2009.