 Complete the following phrase:  The Theater in der Josefstadt brought Nirenska to Vienna in May 1935 for a series of concerts. Each performance consisted of 12 solos. Shortly thereafter, Angelo Sartorios, choreographer at the Teatro Comunale the state opera house in Florence, Italy, asked her to perform as a soloist dancer in a production of the opera Aida. She taught dance classes for children, but the language barrier proved insurmountable; Nirenska called her classes awful. Nirenska left Florence after just three months when the Mussolini regime 