need help with monte cassino

during the Monte Cassino sequence from "A Deadly Calling", in particular the allied bombing sequence, in the background there is a very beautiful, almost monklike religious piece. It is not on either the abbreviated or the full soundtrack and i cant find out what the name is anywhere on the net. Its like it never existed, yet if you watch this particular part, you can clearly hear it in the background. Does anyone know the name of the piece??

Thanks for you time..