And now his tenure on the Tonight Show is coming to an end. Leno has delivered his final monologue, and Jimmy Fallon takes over on February 17. Fallon has a far bigger audience for YouTube clips of his (later) show than he does actual warm bodies watching on the night, but even his clips -including his history of rap medleys with Justin Timberlake and his duet with Bruce Springsteen on Willow Smith’s Whip My Hair - are more memorable than anything Leno did over the previous two decades. Which is not to say that Jay Leno failed to carve out how own particular legend in TV history. He did. It just wasn’t because of his comedy.