So Ralph Vaughan Williams' Hodie - yes. Steve Laurence and Edi Gorme's "Happy Holidays" - no.
Although the theme is classical, we're keeping the definition of Christmas loose. It includes any liturgical music written for use during Advent or Christmas (don't forget all those Magnificats, too).
There are also orchestral works written for the season, and many piano works, too. And there are ballets and dramatic works that have a scene or two (or perhaps the entire story) taking place around Christmas. Also remember works that involve the seasons or the months of the year -- the December portions of those compositions work, too!
You can select anything from medieval chants to modern choral works. So start listening, and be sure to share with your fellow Twitterers using the #XmasClassicsaDay hashtag. There's a very good chance that you'll be turning others on to some great music they might not otherwise discover.
