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Marcy, the obsessed fan of Brad's crime show, complains bitterly about his series changing its theme song. This was written as a little joke on Monk's real life fans, many of whom protested the show's 2nd season musical change from Jeff Beal's instrumental to Randy Newman's vocal theme. Newman's vocals opened this episode as usual, but after Marcy repeats her "don't change the theme song" mantra at the end, Beal's theme was brought back to play over the closing credits. It's been used at the end a number of times since. See more...
Updates: 
Series 2