It's official, Justin Timberlake is one of the coolest guys in the world.

To celebrate the upcoming release of Timberlake's third studio album 'The 20/20 Experience,' the crew at 'Late Night with Jimmy Fallon' is having a week of shows featuring the singer/dancer/actor. And recently, they put together a performance of the singer's hit 'SexyBack' with an old-timey twist.

During last night's episode, Fallon and Timberlake (along with a crew of old-fashioned crooners) formed the Ragtime Gals -- a group which combines the harmony of a barbershop quartet with Timberlake's music. And believe it or not, it was quite good! What, ya don't agree ya big palooka? Watch da video, whydontja?? Now if you'll excuse us, we've got a trolley to catch!