The song is "Merry Christmas Baby" performed by Otis Redding.
Here's last year's post that explains the tradition.
This past weekend we went downtown Detroit for Christmas Wonderfest. Seeing my two favorite faces watching the ice skaters, looking up at the big Christmas tree, and even dancing in their high chairs at the Hard Rock Cafe made it clear to me that this year Christmas is going to be crazy fun.
But first, let's eat some turkey! Happy Thanksgiving!