I want to point out a few things.
I don’t know what else was sung/danced to/whatever on the show that evening, but I am willing to put good money on saying that this very short piece blew them all away. First, good singing (rather than the garbage that is tragically prevalent) reaches everyone and, of all things, note the transcendence of the Latin prayer! Even Howard Stern, easily the most profane public persona ever, is completely moved by their rendition of Webber’s Pie Jesu.
Put this next to the infamous guitar masses (yep, my childhood), campfire-sing-a-long type music, “contemporary” worship services, etc., that are supposed to bring in and enthrall “the young people”, and you can see where the eye-rolling reactions come from. “Young people” (and those of all other ages) do not like being condescended to with dumbed-down, clown music. We were all created in the image and likeness of God and our souls long for transcendence.
I could go on and on, but I think you get my point.