Video After The Jump
Jimmy Fallon and Justin Timberlake went in on some old school tunes when JT visited Jimmy's show yesterday.
This is the third installment in their History of Rap series.
Backed by The Roots band, the duo rapped to "Mama Said Knock You Out," "Sabotage" "Jump Around," "Hip Hop Hooray" and much more.
Check it out below.