JT filled a week of Late Night with new songs, greatest hits, fake arms, “The History of Rap” part four, and a barbershop version of “SexyBack.”

Justin Timberlake appeared on every episode of Late Night with Jimmy Fallon that aired this week.

Image by Theo Wargo / Getty Images

Justin kicked things off with a performance of "Pusher Love Girl," the opening song on "The 20/20 Experience."

The next day, Justin, Jimmy, and a few other guys sang a barbershop version of "SexyBack"...

...and he sang a non-barbershop rendition of his new single, "Mirrors."

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