Neil Young Joins Jimmy Fallon (As Neil Young) for Duet on 'Old Man' — billboard.com

Jimmy Fallon regularly breaks out his killer Neil Young impression, but worlds finally officially collided Tuesday night when Mr. Young finally joined "himself" (Fallon) for a tune.  Fallon's "Young" has previously sang "Whip My Hair" and "Fancy," but this performance of "Old Man" between the two is a first, but hopefully not the last, duet. Watch below. 

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