It would take a musical miracle to reunite legendary 1960s folk rock quartet Crosby, Stills, Nash & Young. But it only took Iggy Azalea to do pull together the next best thing: Crosby, Stills, Nash & Fallon.

Yes, "Tonight Show" host Jimmy Fallon was back in his long brown wig and suede cowboy hat on Monday night as shaky-voiced Young to perform a spot-on four-part harmony acoustic take on Iggy Igg's "Fancy" with the trio and... it was awesome. And when they sing "trash the hotel/get drunk on the minibar," at least three of them (probably) remember what that was really like.

Was it as good as the time CSN did Miley's "Party in the U.S.A." with Jimmy, or the time he played "Whip My Hair" with Bruce Springsteen? Watch for yourself: