CHICAGOÂ is still the one musical with everything that makes Broadway shimmy-shake: a universal tale of fame, fortune, and all that jazz, with one showstopping song after another and the most astonishing dancing you've ever seen. Â In the whirlwind of Chicago's Jazz Age, two of the Cook County Jail's most notorious murderesses"vaudeville star Velma Kelly and chorus girl Roxie Hart"become fierce rivals as they co…