The Dresden State Operetta is the only independent operetta in Germany. These recordings include complete operas, oratorio, operetta, orchestral works and Broadway standards. She was an attractive tenor who sang lieder, chanson and opera and operetta. The company specializes in German language productions of opera, operetta and musicals. The show featured leading singers in selections from opera and operetta. In 1959/60, Slezak appeared at the Metropolitan Opera in Johann Strauss's operetta "Die Zigeunerbaron". The work is performed as an operetta in many professional opera companies. Numerous opera companies have mounted the operetta. A few zarzuelas (Spanish operetta) were even adapted as screenplays during the silent era. In 1932 the comic operetta "Sissi" premiered in Vienna. He wrote the 2006 operetta "Tangier Tattoo", with librettist Stephen Plaice, again for Glyndebourne. A later example is the 1927 burlesque operetta by Ernst Krenek entitled "Schwergewicht" ("Heavyweight") (1927). Much of the characters' dialogue is sung in the style of operetta. Soon, Vienna became the epicenter of operetta productions.