Clinton?
Religious Christmas songs. As opposed to Jingle Bells and Rudolph the Red-Nosed Reindeer.

I'm not religious, but it doesn't stop me having favorite religious Christmas songs. I agree with sharyn about the Cherry Tree Carol. The thing gets stuck in my head every year and I kind of like it there. Great tune to play too.
Here's one version (this is the tune I know) and here's another.

O Holy Night. Local Jay Smith who passed away recently used to do a version that gave me chills. I also like Silent Night - I've never gotten sick of it like other folks I know have. The tune's beautiful and has lots of room to improvise. I used to love playing this on hammered dulcimer.