Love that one. Not too well known I think.
Hayley Westenra’s version is also awesome:
http://www.youtube.com/watch?v=gjykMVzFd7g
Another one from her Christmas album:
Veni Veni Emmanuel
http://www.youtube.com/watch?v=h_zwV—INfs&feature=related
David Archuletta- Pat a Pan
http://www.youtube.com/watch?v=3i1HIKwX_bI