For the past week, Justin Timberlake has entertained millions while co-hosting Late Night with Jimmy Fallon. Singing a different song from his new album, The 20/20 Experience, every night, Timberlake has been hard at work promoting the project and in turn is expected to sell over 500k copies in the first week; March 19-26th. During the last show, Timberlake and Fallon performed the fourth installment of their impressive “History of Rap” routine, along with a variety of JT’s greatest hits. Check out the medley above, and watch “History of Rap 4” after the jump.

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