This is a correct answer to the following question about Sound mass. Yes or no?
Answer: Other examples include European "textural" compositions of the fifties and sixties such as Krzysztof Penderecki 's Threnody to the Victims of Hiroshima (1959) and György Ligeti 's works featuring micropolyphony in works like Atmosphères (1961) and his Requiem (1963-65).
Question: what composer used sound mass
