Last night, the legendary ’60s folk-rock vocal harmonizers Crosby, Stills & Nash were musical guests on Jimmy Fallon’s Tonight Show. This, of course, presented a golden opportunity for Fallon to trot out his uncanny impersonation of Neil Young, the trio’s sometime bandmate, and the four of them sang Iggy Azalea and Charli XCX’s summer-conquering “Fancy,” playing it as an elegiac hymn and finding room for the “who dat, who dat” breakdown. Those guys all get credit for doing it and for maintaining a straight face throughout. Crosby, Stills & Nash also sang their classic “Teach Your Children Well.” And as an online bonus, they also did “So Begins The Task,” a song that appeared on Stills’s 1972 album Manassas. Watch all those performances below.

Crosby, Stills, Nash & Young’s live box set CSNY 1974 is out now on Rhino.