As they reached “Laudamus te,” the organ fell silent, and I realized they were singing the Gloria in alternatim, as they often do at Papal Masses, and the choir broke out into fantastic polyphony. That’s when I just about lost it.
I went weak in the knees. My jaw literally hung open. I felt chills straight up my spine as I mouthed along with the prayers the schola was singing in such a sublime manner. The beauty of the church, combined with the stunning beauty of the music, had quite literally sucked me into the liturgy unfolding before me. It was almost a form of ecstasy.
The entire post by Ben Yanke is outstanding. Plus he recorded parts and those are featured on his page.