Who is Tosca? And what makes her one of opera's greatest heroines? We asked the two singers playing the title role in Tosca at Melbourne's Margaret Court Arena (Nadine Benjamin and Karah Son) about this extraordinary character. Tosca opens in less than two weeks, with a strictly limited season from 24 to 30 May, before moving to Sydney Opera House. opera.org.au/tosca Supporting Partner: HSBC | Opera Australia