 Complete the following phrase:  Beginning in 1982, Shaffer served as musical director for David Lettermans late night talk shows: as leader of The Worlds Most Dangerous Band for Late Night with David Letterman 19821993 on NBC, for which he also composed the theme song, and as leader of the CBS Orchestra for the Late Show with David Letterman 19932015 on CBS. Letterman consistently maintained that the shows switch to CBS was because NBC fired Paul for stealing pens or some other trivial reason. Shaffer guest-hosted the show four times when Letterman was unavailable: February 9 and 11, 2000, during Lettermans recovery from his quintuple heart bypass surgery; March 24, 2003, when Letterman was suffering from shingles; and January 19, 2005, when Letterman went to receive an award for his racing teams victory in the 