Broadway in Chicago, the producing organization that books touring shows for the Shubert, Oriental and Cadillac Palace theatres, has announced a particularly bland 2004-05 season. Aside from the pre-Broadway Monty Python musical Spamalot, which we await with cautious optimism, the season includes a revue of Disney film music, a musical built around Elvis tunes, another Jackie Mason rehash and yet another iteration of Evita, plus the frightening prospect of Sandy Duncan in The King and I. We're also getting a return engagement of the fluffy ABBA musical Mamma Mia, which played here three years ago on its way to New York.