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Jimmy Fallon and The Roots recruited Paul McCartney and a whole bunch of other famous people to do an a cappella rendition of his 1986 hit "Wonderful Christmastime." The sing-along was to promote the upcoming animated movie Sing, which from the looks of it is about animals that—you guessed it—sing. Hey, at least you know what you're getting up front.

Reese Witherspoon, Matthew McConaughey, Tori Kelly, Scarlett Johansson and Seth McFarlane all lent their famous voices to the family film as well as to this mini-music video. Don't their floating heads in separate cells make them look like one giant, multi-species Brady Bunch?

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That would have been a much different show.