"ShowBusiness: The Road to Broadway" follows the four high-profile productions that would eventually become Tony nominees for Best Musical: a big-noise musical named "Wicked," the Rosie O'Donnell/Boy George collaboration, "Taboo," the much-anticipated Tony Kushner musical, "Caroline, or Change," and an irreverent puppet show named "Avenue Q." From casting to staging, from previews to red-carpeted opening nights, from the announcement of Tony nominations to the suspense-filled Tony Awards, "ShowBusiness" provides a never-before-seen look at the inner workings of Broadway musicals.