I know Anastasia isn't directly a Christmas movie but...come on the song is called once upon a DECEMBER how much more Christmas ish do you need it to be?
To that night in Bethlehem
Forever under the sun
To that night in Bethlehem
That the word safely came
There are bright edges on the sky
And the ground in a white covering
Look at baby Jesus without a crib
And the Virgin in delighted love
To that night in Bethlehem
Forever under the sun
I always follow this song with this instrumental piece, although it has nothing to do with Christmas
"Flame out of the Land" by Himekami