the members learned verdi's famous requiem mass, with its plea to god for deliverance from evil.urvivors said they derived spiritual strength from singing the requiem to their captors. bob faw reports. >> every note. get inside of every note. inside of every note. >> in a washington, d.c., church an impassioned conductor implores his choir. ♪ >> don't move, don't move. very nice. what you're doing is very nice, and there's no room for that. it has to be extraordinary. the sort of thing that you will remember all of your lives. >> whenever he can, murry sidlin urges them to do more, because what they're rehearsing, what they are trying to commemorate, is another performance by another choir in horrific circumstances -- jewish prisoners in a nazi concentration camp. >> to us, it's just damn words. they leave e rehearsal and walk over bodies to get back to their barracks. we cannot be indifferent. >> this music, verdi's "lyrical mass for the dead," is a full-throated testament to the majesty and judgment of god, profound even in this rehearsal at washington's kennedy center. but it