Thanks SNAFU! That's probably the same scene. It has been staged in a variety of ways, but only a couple of cast recordings have ever included the music, which I love.
One particular production I saw (some others around here may have seen it as well) staged the scene with a few people coming out at a time representing different eras in war history. The monks get killed by the nuns who get killed by the WWI guys who get killed by the WWII guys, etc. with bodies piling up ending with a soldier "pushing the button" accompanied by a blinding flash of light. Then they performed the same choreography backwards in reverse order from the end to the beginning. They then repeated the entire sequence two more times getting faster each time. It was brilliant.
"What can you expect from a bunch of seitan worshippers?" - Reginald Tresilian