It's not about Christmas, but this is so delightful it may well lift you into a Christmassy mood. Just click this link and turn up the sound.
When it's finished playing, you may like to click the link on the top left of your screen to go to Care2, a cornucopia of treats for people who like things green. It claims eight million members.
[Thanks to Suzanne, who passed this on in an email to friends.]