'Tonight Show' host Jimmy Fallon loves transforming himself -- quite fully, and often kind of unnervingly so -- into famous musicians to sing unexpected jams to his audience. He last did it with Stevie Nicks, outfitting himself (both in look and sound) to resemble Tom Petty so that the duo could belt out "their" hit song "Stop Draggin' My Heart Around," and now he's brought that kind of attention to Neil Young.

But Fallon (and, later, Crosby, Stills, & Nash) are not interested in singing a trademark Young song -- oh, no, they're going for something far more modern -- and the newly reunited "band" set their sights on something for the kids: an oddly stirring version of Iggy Azalea's "Fancy." It's for the kids.

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