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Personality Jimmy Fallon and singer and actor Justin Timberlake dance to 'Single Ladies' during the Men's Singles Quarterfinals match, September 9, 2015.

"Tonight Show" host Jimmy Fallon and singer Justin Timberlake are probably two of the most famous hip-hop fanatics on the planet.

The guys, on occasion, will launch into their energetic "History of Rap" medleys on Fallon's late-night talker — backed by the virtuoso "Tonight Show" house band, The Roots — showcasing their lyrical chops with karaoke renditions of current and classic hits.

The guys did it again Wednesday night with "History of Rap 6."

Check out the video below:

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