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.
Augustyn Bloch Augustyn Bloch (13 August 1929 in Grudziądz – 6 April 2006 in Warsaw) was a Polish composer and organist, student of Feliks Rączkowski and Tadeusz Szeligowski. He was an active concert organist, conducted his own music, and wrote music for the Polish Radio Theater.