Justin Timberlake finished up his week on NBC's Late Night with Jimmy Fallon  on a high note.

After teasing that they couldn't possibly do another rap medley, the singer and his host did just that with a raucous and funny History of Rap 4.

For more than six and a half exhausting minutes, the pals sampled 26 different tunes!

Highlights included Jay-Z's Izzo, The Notorious B.I.G.'s Hypnotize, Eminem's  Lose Yourself, and the essential rap classic from 2 Live Crew, Me So Horny.