Rock legends Crosby, Stills & Nash visited "The Tonight Show" on Monday night to promote the release of "CSNY 1974," a box set collection of music from the group's 1974 reunion tour with Neil Young. Though Young wasn't onstage, host Jimmy Fallon filled in for him. It wouldn't feel right to perform a CSNY song with the greats, so Fallon opted for something a little more campy -- Iggy Azalea's "Fancy" (a song Fallon apparently likes a lot!).
Thankfully, the trio also performed original music, “Teach Your Children” and “So Begins the Task":
"CSNY 1974" is available July 8.