Well this is outstanding. Both the Black Keys and Vampire Weekend's Ezra Koenig showed up on Colbert last night to argue about who's gotten their music in more commercials. Koenig: "Are you challenging us to a sell-out-off?" Black Keys' Dan Auerbach: "Bring it on, Cape Cod!" Colbert: "Clearly you have both equally whored out your music!" Somehow the "musicians trying to be comedians" woodenness of it all only makes it funnier. This is Colbert's best bit in months; watch below (both bands show up around 4:30), and lament only that there was no way to get Pomplamoose involved.