Ok, I've narrowed it down to 5 versions.

Which is the best version of this Christmas Classic?

Louis Armstrong & Velma Middleton

Willie Nelson & Nora Jones

Leon Redbone & Zooey Deschanel (from the movie Elf)

Bing Crosby & Doris Day

Sammy Davis Jr & Carmen McRae

(had to put these in as links because you can't imbed more than 3 videos per post)