Henryk Mikołaj Górecki ( gə-RET-skee, Polish: [ˈxɛnrɨk miˈkɔwaj ɡuˈrɛt͡skʲi] ; 6 December 1933 – 12 November 2010) was a Polish composer of contemporary classical music. According to critic Alex Ross, no recent classical composer has had as much commercial success as Górecki. He became a leading figure of the Polish avant-garde during the post-Stalin cultural thaw. His Anton Webern-influenced serialist works of the 1950s and 1960s were characterized by adherence to dissonant modernism and influenced by Luigi Nono, Karlheinz Stockhausen, Krzysztof Penderecki and Kazimierz Serocki.
https://en.wikipedia.org/wiki/Henryk_G%C3%B3recki