My friends from the Chicago-area choir Aestas Consort put up this YouTube montage with the a capella chorus from Vespers, Herr Christ, der einig Gotts Sohn (Lord Christ, the only Son of God). This is the one that splits from four to eight to 16 voices and back.
They sound gorgeous! Maurice Boyer conducts; this was recorded at Grace Lutheran Church, River Forest. Thank you, Steven, Levi, Maurice, and everybody!
I’ve gone ahead and made a German/English edition of this, since I had translated it for the program notes. Yes, you could sing this in English if you liked! Click on the page at the left for a look-see, and if you want to see all of it, just let me know!