In a classic Late Night moment, Jimmy Fallon managed to combine reggae with a barbershop quartet. If anyone tells you this is a Bob Marley song, please do society a favor and tell them they're stupid. It is not. It's called "Sweat (A La La La La Long)" by Inner Circle. It was released in 1992. Anyway, enjoy. 
 

[H/T: Warming Glow]