 Also, Williamson assisted his brother-in-law, Chris Löfvén, on "Oz", an Australian rock musical film that retold "The Wizard of Oz (1939 film)" on the streets of Melbourne.The fictional Land of Oz rarely comes up in Australian conversation; the term is used almost exclusively as the nickname for one's own country.The title of the play "Emerald City" has been used as a frequent moniker and nickname for the city of Sydney ever since the play was first presented.