The Polish composer Martin Rosenberg (24/12/1890-1943) has written a “Jüdischer Todessang” (Jewish Death-Song) (“Jewish Requiem”) which was actually based on a ubiquitous Jewish folk song, called “Tsen Brider” (“Ten Brothers”) while being in a concentration camp during Nazi Germany in 1942. Rosenberg’s “Jewish Requiem” score has not survived and we know about this piece only because of the efforts of Aleksander Kulisiewicz, a non-Jewish political prisoner who witnessed the rehearsals of the prisoners’ choir.
See also: Josua R. Jacobson, who made an arrangement.