Justin Timberlake continued his media blitz in support of 'The 20/20 Experience' this week with a surprise SXSW announcement -- and with his final night of 'Timberweek' on 'Late Night With Jimmy Fallon.'

He went out with a bang. Timberlake not only recapped his week, but also delivered a fourth installment of his and Fallon's classic 'History of Rap' medleys.

Timberlake also announced that he will be on hand to close out SXSW tonight (March 16) with Questlove (who is famously part of Fallon's Roots house band). Timberlake will headline the final MySpace Secret Show -- appropriately enough, as he is the face of and owns a slew of stock in the now-struggling brand.

While we doubt he'll perform 'The History of Rap' at the festival, you can watch it above. Just off the tops of our heads, the medley included Chamillionaire's 'Ridin' Dirty,' Wiz Khalifa's 'Black and Yellow,' Nelly's 'Ride Wit Me,' the Beastie Boys' 'No Sleep til Brooklyn,' Macklemore's 'Thrift Shop,' 'Rump Shaker,' 'Me So Horny,' Jay-Z's 'I.Z.Z.O. (H.O.V.A.),' Eminem's 'Lose Yourself,' Snoop and Dre's 'Gin and Juice' and a slew more. The duo opened and closed the medley with the classic Sugar Hill Gang joint 'Apache (Jump On It).'

Combined with all his promo and his summer tour, it's not just a Timberweek. It looks like 2013 will be a Timberyear.

Watch Justin Timberlake Recap 'Timberweek' on 'Late Night With Jimmy Fallon'