It is an absolute nightmare to sing. Intervals don't work the way we're used to, tempi are strange, harmonies don't sound "right" to our 21st century ears.
Parish choir did the Josquin "Tu pauperum refugium" awhile back. Drove us nuts. I finally found a decent performance online (but a horrible recording with cellphones and squeaks and all sorts of awful stuff in the background) here.
My husband is the backup guitarist for our "Youth Mass Combo" - he's an old rocker (and a pretty good one) who dabbles in classical guitar, and he can't stand the stuff they play. He says it's not good rock, not good pop, and not good church music either. I never go to hear him because I would point and laugh. It really is very dated 70s pop, and not the best the 70s had to offer either.
We’ll have a capella ladies’ Spanish choir on Sunday. DP will be in Myrtle Beach, the alternate musician’s wife is having a baby shower, and the occasional substitute guitarist caught me looking at him last week and zipped out of the church before I could catch him!