For 10 points, identify this Polish composer of Threnody for the Victims of Hiroshima.
Settings of the three stanzas of Rilke's poem "The End of Autumn" are scattered throughout the twelve movements of this composer's choral eighth symphony, while the sole movement of his second symphony is in modified sonata form and features numerous quotations of "Silent Night", giving it its informal nickname "Christmas". Various tools are used to strike an iron bar in the second of his Lucretius-inspired pieces called De Natura Sonoris, while his other compositions include the electroencephalogram-inspired (*) Polymorphia and a symphony called Seven Gates of Jerusalem. An a cappella major triad at the end of the Stabat Mater and another major triad at the very end are the only exceptions to the atonality of his 1966 St. Luke Passion. His most famous work opens with a number of staggered dissonant blasts from the 52 stringed instruments for which it is scored; that work was originally titled "8:37". For 10 points, identify this Polish composer of Threnody for the Victims of Hiroshima.
Settings of the three stanzas of Rilke's poem "The End of Autumn" are scattered throughout the twelve movements of this composer's choral eighth symphony, while the sole movement of his second symphony is in modified sonata form and features numerous quotations of "Silent Night", giving it its informal nickname "Christmas".
{Krzysztof Penderecki} [accept variants of “{Penderecki's} Symphony No. 8”, or “{Songs} of {Transience}”, or “{Lieder der Vergänglichkeit}” before “this composer” is read]