Justin Timberlake spent his last night on "Late Night With Jimmy Fallon" with the fourth version of their viral "History of Rap".

Timberlake and Fallon debuted "History of Rap" in 2010 and it became an instant hit on the web. Justin and Jimmy followed it up with two more versions a year later.

"History of Rap 4" includes hits from the '80s up through last year.