A very traditional song, but a non-traditional rendition: downhere "Good King Wenceslas"
(best quality I could find, the version on their album is much better)
---------- Post added at 11:51 PM ---------- Previous post was at 11:44 PM ----------
And, if that isn't untraditional enough for you:
Straight No Chaser "The Christmas Can-Can"
Nostalgia Critic "Holiday Clusterfuck"