"Christmastime" by The Smashing Pumpkins.

Madeline Peters singing Jingle Bells and Michelle Creber singing a couple Christmas songs combined with Hush Now Quiet Now.

I quite enjoy the Trans-Siberian orchestra. They're definitely metal christmas.

EDIT: also it's a family tradition to wake everyone up by blasting John Lennon's "So This Is Christmas" at 7am.

The entire Jethro Tull Christmas album.

That and Father Christmas by The Kinks.

Oh, and Wonderful Christmas Time by Paul McCartney.

"Meri Kuri" by BoA.

"Lonely This Christmas" by Mud.

"Driving Home for Christmas" by Chris Rea.