"What's the beef?"
I'm not usually a "They're playing our song!" kind of guy. Music and movies are not really seasonal in my mind, at least in the sense that holidays are for family, not for artificial stimulation.
Nevertheless, there are indisputably some movies that define the holiday season. Here is my short list:
Notice a couple things: (1) I've named Polar Express as a "modern classic". This movie is worthy of joining the "Christmas Movie Pantheon". (2) I've included A Child's Christmas in Wales, although no one in the USA has ever heard of it, and (3) I've excluded White Christmas, Miracle on 34th Street, and It's a Wonderful Life. Deal with it.
I got my first gift of Christmas already:
I had declared last night to be a night for watching holiday classics, and was determined to buy a copy of Scrooge/A Christmas Carol, starring Alastair Sim. People had a hurried consultation and had me open a gift: apparently they had already bought it for me. Wow! I've wanted those two DVDs time out of mind, and hadn't been able to find them.
What a great start to Christmas!