text: Episode structure The show's opening credits featured a series of shots of New York City as the CBS Orchestra performed the Late Show theme (a livelier variation of the more jazzy Late Night theme). The announcer presented the names of that night's guests, as well as Paul Shaffer and the CBS Orchestra, then introduced Letterman. On rare episodes, the show began with a cold open as Letterman, dressed casually, briefly interacted with a celebrity or performed a short sketch backstage before the traditional opening sequence began. As with his previous shows, the copy for the open included non sequiturs about New York and Letterman, though the former would change after the September 11 attacks to simply "the greatest city in the world".
  In the last few years, Alan Kalter included himself in the introduction. In addition, Letterman took to dashing across the stage either just before, while, or just after Kalter introduced him. In years prior, Letterman would be greeted by two female models, sometimes in costume. For an extended stretch of episodes, one of the models would be performing with several hula hoops, while the other would be wearing a metal suit and operating a grinding machine against her abdomen, a carry-over from their first appearance on the sketch, "Is This Anything?"