Der Opernball (The Opera Ball) is a charming, hot-blooded operetta that delights audiences not only with its comedy of errors and confusing events but also with its classics like "Komm mit mir ins Chambre separee" – in an unforgettable musical setting by the Graz composer Richard Heuberger. It is a piece of Graz music history – and it was staged and recorded at the Graz Opera. During the Carnival season two wives devise a marital fidelity test for their husbands at the opera ball. A competition between the sexes and erotic adventures ensue. When the protagonists return home with hangovers on the following morning, many questions remain open: Who was with whom, when, and where? What has this one night changed? How, where, and with whom will life go on? Following the first performance, Der Opernfreund wrote, "Margareta Klobuèar sang outstandingly. Sieglinde Feldhofer is a special favorite of the Graz public. She sang her part with a clear voice and flawless technique. And the male roles too were superbly cast."