Scroll down to No. 13 in the mpg files. It's sung as a baritone solo - didn't see an SATB setting.
If you watch enough of those YouTube videos with the score scrolling along, you can learn to read music easily enough! When I became Catholic I had never read Gregorian notation, it is quite different from our standard "staff notation". I had to work at it a bit, but I'm pretty confident with it now.
(((Tears))) Thank you, I’ve searched over the years and never found the right one... Last year, I lost my aunt who was the soprano- she was in her nineties and still sharp as a tack, but had the family breathing problems and couldn’t sing as she once did. How she used to manage that note, I’ll never know- even our lead soprano couldn’t- that was the only time we had a solo. I haven’t heard that hymn sung by anyone else before. Thank you again, and God bless you! You touched a heart today.