From Wikipedia: "Krzysztof Eugeniusz Penderecki (/ˈkʃɪʃtɔːf ˌpɛndəˈrɛtski/; Polish: [ˈkʂɨʂtɔf ɛuˈɡɛɲuʂ pɛndɛˈrɛt͡skʲi]; born 23 November 1933) is a Polish composer and conductor. The Guardian has called him Poland's greatest living composer.[1] Among his best known works are his Threnody to the Victims of Hiroshima, St. Luke Passion, Polish Requiem, Anaklasis, 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."