Justin Timberlake and Jimmy Fallon went old-school again last night for their third masterful installment of "A History of Rap" on Late Night. Backed by house band the Roots, Timberlake and Fallon got down with a seamless medley (complete with near-perfect dance moves) including such timeless hip-hop classics as Sir Mix-a lot's "Baby Got Back," "Bust a Move" by Young MC, LL Cool J's "Mama Said Knock You Out," as well as more recent hits such as "Stronger" by Kanye West and Nicki Minaj’s "Super Bass." Check out the duo's previous joints here and here.