In response to Chicago as a film production versus a stage production, it think that through the magic of film editing, the juxtaposition of musical elements along with the dramatic scenes made for a seemless, powerful perspective that would have been almost impossible to occur on stage. The court room scene and the Roxie sex scene/Velma stage scene are two memorable energetic scenes that really fed off their different counterparts making the whole experience exciting, thrilling. The same goes for Latifa and the ward matron/stage scene. Even the fade back from the Cellophane musical, with John C. Reilly to the scene where he is ignored by Richard Gere at the end, just highlights his earlier musical number. While its possible to something similar on stage, it just wouldn't have the immediate impact at film can.