"Once Upon a December", a hauntingly beautiful song sung by Anya as she struggles to remember why the Romanov palace feels so distantly familiar to her. For bonus points, it uses the melody of the musicbox lullaby heard at the beginning of the film, making the song's subject matter even more powerful. That Truck Driver's Gear Change for the final verse is especially chilling. Even people who dislike the film for various reasons will admit that this song, and the sequence in which it is played, is one of the best elements of the film.
"If I can learn to do it". The song is hilarious most of the time, and one point, it freezes to show shock when 'Anastasia' gets something right that the other two haven't gone over: "I don't believe we told her that." Funny!