Agnus Dei

by Samuel Barber

Best known as Barber's Adagio, the composer himself reworked the choral version of this piece. 

Here's one of those scrolling music videos that seem pretty helpful.

I think it's impressive how quiet a big choir can sound here although that one soprano...

Lovely vowels on this one and the high soprano really nails the tricky bit. Ooh and listen to that low bass.