Based on the book by Wladyslaw Szpilman.
Amazon: On September 23, 1939, Wladyslaw Szpilman played Chopin's Nocturne in C-sharp minor live on the radio as shells exploded outside―so loudly that he couldn't hear his piano. It was the last live music broadcast from Warsaw: That day, a German bomb hit the station, and Polish Radio went off the air.