Whenever musician and 'In Time' star Justin Timberlake is on 'Late Night with Jimmy Fallon,' it's safe to say it's hip hop duet time. The other night Jimmy and Justin performed part three of their ongoing 'History of Rap' series.

Much like the previous installments, 'The History of Rap,Part 3'  gives viewers a crash course on early '90s hip hop hits like 'Supersonic' and 'Jump Around.'

Check out Timberlake and Fallon doing their medley of rap songs (including 'Parents Just Don't Understand' by DJ Jazzy Jeff and the Fresh Prince) below.