Sextet was by the Polish composer who has completed how many operas?
Krzysztof Penderecki Krzysztof Eugeniusz Penderecki ( ; ] ; born 23 November 1933) is a Polish composer and conductor. "The Guardian" has called him Poland's greatest living composer. Among his best known works are his "Threnody to the Victims of Hiroshima", "Symphony No. 3", "St. Luke Passion", "Polish Requiem", "Anaklasis", "Utrenja", four operas, eight symphonies and other orchestral pieces, a variety of instrumental concertos, choral settings of mainly religious texts, as well as chamber and instrumental works.
Wojciech Bogusławski Wojciech Bogusławski (9 April 1757 – 23 July 1829) was a Polish actor, theater director and playwright of the Polish Enlightenment. He was the director of the National Theatre, Warsaw, ("Teatr Narodowy"), during three distinct periods, as well as establishing a Polish opera. He is considered the "Father of Polish theatre."