6. Il Est Né / Ca Berger is by Anna McGarrigle, Kate McGarrigle & The Chieftains and is on the 1991 Chieftains album The Bells of Dublin.
I've long been a Chieftains fan and actually saw them perform once when I was a student in Aberystwyth. At some point they decided that instrumental music could be a bit boring and so they saw the way forward was to have just about anyone they fancied sing with them. On this their only (?) Christmas album they drag in not only the McGarrigle sisters but the Renaissance Singers of Belfast, Elvis Costello, Burgess Meredith, Marianne Faithfull, Nolwen Monjarret, The Voice Squad, Nanci Griffith, Jackson Browne and Rickie Lee Jones and Suzie Katayama. They also perform with the Northumbrian Pipe of Kathryn Tickell and the accordion of Brendan Begley and on their own. It's mostly carols and Christmas airs but some of it is not necessarily Christmassy. There are 23 tracks altogether, all good fun. The bells of Dublin themselves also feature. I got mine off i-tunes. The Wren in the Furze is another favourite.