In October 1942, SS guards at the Sachsenhausen concentration camp violently disbanded a rehearsal of a secret Jewish choir led by conductor Rosebery d'Arguto. Many in the group did not live to see morning, and those who survived were deported to Auschwitz-Birkenau. Only one of its members survived the Holocaust. Yet their story survives, thanks to Aleksander Kulisiewicz. An amateur musician, he was not Jewish, but became friends with d'Arguto in Sachsenhausen. D'Arguto tasked him with a mission: to save the musical heritage of the victims of the Nazi camps. In Sing, Memory, Makana Eyre recounts Kulisiewicz's transformation from a Polish nationalist into a guardian of music and culture from the Nazi camps. Aided by an eidetic memory, Kulisiewicz was able to preserve for posterity not only his own songs about life at the camp, but the music and poetry of prisoners from a range of backgrounds. They composed symphonies, organized clandestine choirs, and gathered to perform for one another. For many, music enabled them to resist, bear witness, and maintain their humanity in some of the most brutal conditions imaginable. After the war, Kulisiewicz returned to Poland and assembled an archive of camp music, which he went on to perform in more than a dozen countries. He dedicated the remainder of his life to the memory of the Nazi camps.