A classic. Merry Christmas from Dave Bow, David Bowie, Bing Crosby and The Mercury. May dinner with your friends and relations be every bit as awesome as this video of "Peace on Earth/Little Drummer Boy" (though a little less awkward).
For bonus cheer, you can see John C. Reilly and Will Ferrell recreate this classic meeting of voices almost note for note.
h/t to Jacob Schraer