How many acts are in a Broadway musical? Tagged: length, musical, script, scriptwriting, structureTypically, Broadway musicals have two acts. These acts are more distinct and defined than film acts, since musicals often have an act break between the two. More from johnaugust.com Big Fish, the musical Two things I liked about Spider-Man: Turn Off The Dark More from screenwriting.ioHow do I describe a scene when some of the action…What does "Off him..." mean in a screenplay?What does OOV mean?