Jimmy Fallon and Kelly Clarkson took viewers on NBC's "The Tonight Show Starring Jimmy Fallon" on a trip through musical history Monday night, performing the best pop music duets of all time.

And there's not many they missed, if any.

I don't have my list of favorite duets of all time in front of me right now, but I'd be hard pressed to say they didn't hit all the big ones.

What do you think? Did they miss one?

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