Break out your best polyester, Mamma Mia! returns to Chicago and it is better than ever. After almost a decade since its West End premier, the ABBA based musical has been seen by over 32 million people worldwide and an average of 17,000 attend show every single night. With the film version also becoming one of the summers box office blockbusters (to this reviewer's dismay) Mamma Mia! is an infectious and delightful show that will reign as one of the best musicals of the last twenty years and shows no sign of slowing down.