Crosby, Stills, Nash & Iggy Tweet Posted July 8th, 2014 @ 12:56pm Jimmy Fallon's Neil Young impression is BRILLIANT. But it's always been missing something... something like... the rest of Crosby, Stills, Nash & Young? NO MORE! The real CSN joined Jimmy for this version of Iggy Azalea's "Fancy": BACK TO THE MATTSPACE!!!