Every year I try to buy one new Christmas album. It's fun to get a fresh take on the familiar Christmas songs. Last year I bought an album Christmas songs featuring obscure medieval instruments--"A Christmas Collection, featuring The Miner Museum of Vintage, Exotic and Just Plain Unusual Musical Instruments" by Gregg Miner.
Far and away, though, my favorite Christmas album is Andrew Peterson's "Behold the Lamb of God" (you can either stream it on your computer or just take my word and buy it for yourself). It is comprehensive, weaving the prophecies of the Old Testament into the joyful story of the Advent Season.
He now has a number of videos of his yearly concerts online. I'll post "O Come, O Come Emmanuel" below. For those of you who can't make it to Nashville this time of year, this is a chance to hear that Nashville Sound on an ancient Christmas Classic.