I agree that having good xmas music is essential to Yuletide festivities, so good call on this thread!

The holidays wouldn't be the same for me and mine without:
Terry McDade w/ The McDades, Midwinter
Terry McDade w/ The McDades, Noel

Terry plays Celtic harp and leads a group made up of his very talented children. The tunes are a combination of well-known, obscure, and totally unheard-of (ancient) tunes, all played with a Celtic/world music twist.

They play an annual xmas series of very popular shows in Edmonton, Alberta, Canada at an old settlers homestead that has been converted into a museum. You can hear some examples of his music on myspace (not the xmas stuff though) and order CDs from Free Radio Records.