If you could have only one Christmas album/CD, which one?

Except the Bach passions are for Easter not Christmas .

Two sides of the same coin, Schubert ;-)!

For Pop, it's "A Christmas Gift For You From Phil Spector", an album of Spector's Phillies Records singers (Darlene Love, The Ronettes, The Crystals, Bob B. Soxx & The Blue Jeans) doing classic Christmas songs plus a newly written (by the legendary team Ellie Greenwich and Jeff Barry) one, "Christmas (Baby Please Come Home)", sung magnificently by Darlene. 

bdp24, nails it. Perfect holiday party music to get everyone smiling.
As a followup, watch Darlene Love sing this:
https://www.youtube.com/watch?v=HOhKQyRAo6k

Happy holidays,
Spencer

I just wanted to say Merry Christmas everyone, and thanks for the great list of Christmas music!!  I'm enjoying it right now, Christmas morning in Snowy Colorado!