Justin Timberlake has been on Jimmy Fallon all week, and there have been all kinds of shenanigans happening --barbershop quartets, balsam wood arms and spoofs with Michael McDonald.

Timberlake's new album, 'The 20/20 Experience' comes out on Tuesday, March 19, but you can hear the whole album now on iTunes!  See everything below!

Barbershop Quartet -- Sexy Back

Michael McDonald Spoof

Justin Timberlake and the Roots

Customer #12 -- Part 1

Customer #12 -- Part 2

Justin Timberlake -- Mirrors