The Mariinsky Theatre Second Stage hosted which Russo-Austrian soprano on May 2, 2013?
Anna Netrebko: Anna Yuryevna Netrebko (Russian: Анна Юрьевна Нетребко , born 18 September 1971) is a Russian operatic soprano. Anna Netrebko:  She now holds dual Russian and Austrian citizenship and currently resides in Vienna, Austria, and in New York City.
i don't know