Whether as a guilty pleasure, or openly.
I have always been partial to the more religious (despite being an atheist) songs like "God Rest Ye Merry Gentlemen" and "Hark! The Herald Angels Sing", etc.
Favorite non-traditional songs:
- Sufjan Steven's "It's Christmas! Let's Be Glad!"
- XTC 's(though released under the name "The Three Wise Men") "Countdown to Christmas Partytime". Yes, it's as cheesy as it sounds.