Mark Ronson turned up on last night's episode of the Late Show with David Letterman to perform "A La Modeliste," a song recorded for the Grammys' Re:Generation project, with special guests Erykah Badu, drummer Zigaboo Modeliste and members of the Dap Kings. The song, a tribute to the jazz funk of New Orleans, clearly impressed Letterman, who remarked, "That's it, that's all you want right there!" after the band finished the tune.