Penderecki: "De Natura Sonoris No. 1" http://www.youtube.com/watch?v=suuwg24QHYM&feature=related Penderecki: "De Natura Sonoris No. 2" http://www.youtube.com/watch?v=t9d8OopJrhg&feature=related １９３９年ナチスドイツのポーランドへの侵攻、…