I don't watch Late Night. In fact, I don't know that I watch anything on network tv. However, I found this both funny and sort of impressive: Jimmy Fallon (as Neil Young) and The Boss (as himself) singing Willow Smith's highly-annoying "Whip My Hair".
(Sorry, can’t embed a copyrighted clip without the commercial at the beginning.)
That's one good impersonation. Which I realize is a somewhat dubious distinction, but still... gotta hand props to Jimmy, right?
edit: I did look up the “History of Rap” and it was funny! I love Justin Timberlake, he never seems to take himself too seriously. I might have to start DVRing “Late Night”.