In the spring of 1944, a handpicked group of Nazi officers was treated to an unusual performance by inmates in a concentration camp. What appeared to be a soaring rendition of a choral masterpiece was intended as a subversive condemnation of the Nazis and a desperate message to the outside world. In the face of horrific living conditions, slave labor and the constant threat of deportation to Auschwitz, the Jewish inmates of Terezin concentration camp — artists, musicians, poets and writers — fought back with art and music.