Fresh off the buzz from the latest of his several successfully hilarious Saturday Night Live stints, Justin Timberlake made an appearance on Late Night With Jimmy Fallon yesterday to perform a barbershop quartet version of his famous hit, “Sexyback,” produced by Danja.  Backed by Fallon himself and the two other male singers that create the quartet, curiously dubbed “Rag Time Gals,” Justin put a new twist on a pop favorite with typical babershop harmonies and wardrobe to match.  Watch for yourself below.