Chorus of the Teatr Wielki – Polish National Opera. The chorus has been active virtually since the establishment of the Opera Theatre in Warsaw. It has sung in operas and sometimes also in stage productions. Since the 19th century, its performances in the Teatr Wielki (Grand Theatre) have constantly garnered enthusiastic press reviews. The opening of the restored building of the Teatr Wielki in 1965 provided the impulse for expanding the Opera Chorus. The new huge stage required a large and powerful ensemble, which was to become a real highlight of opera productions. Since that time the chorus has been conducted by Józef Bok, Zofia Urbanyi-Świrska, Henryk Wojnarowski, Lech Gorywoda, Jan Szyrocki, and Bogdan Gola, who have each played a role in its steady development. The Chorus of the Teatr Wielki in Warsaw has performed over 80 famous operas, gaining recognition among critics and audiences both at home and abroad. It has taken part in numerous international concert tours of the Teatr Wielki – Polish National Opera, appearing on the most important music stages in Europe and at many famous open-air festivals.