Once you've worked retail from Nov 1st, to Jan 1st, you have no Christmas spirit left in you, and Christmas music incites nausea above anything else. I don't even remember what any Christmas songs are my psyche is too damaged. But if I had to pick one from my childhood I'd say the song the Who's sang in The Grinch Stole Christmas at the end holding hands around the town Christmas tree.
(not the Jim Carrey version, the classic cartoon.)