I agree with the Bing Crosby/David Bowie "Little Drummer Boy/Peace On Earth."
I also love this one song we sang in my chorus class last year that began:
"The first day after Christmas
My true love and I had a fight
And so I chopped the pear tree down
And burned it just for spite!
And with a single cartridge
I shot that blasted cartridge
My true love, my true love, my true love gave to me."
In my pants, she has burst like the music of angels, the light of the sun! --Marius Pantsmercy