https://m.youtube.com/watch?v=fjtwyZAhCcs#fauxfullscreen
It might seems completely incomprehensible how this great harmony comes about.
But if you study a score including the bass (which is missing above) you may realize that:
A great key to understand is that the 7ths with respect to bass are prepared from the previous chord and then the 3rd with respect to bass added [Bach, Niedt].
For example:
At 1:12 bass becomes E.
The altos with be ne di ctis prepare the 7th note which is D. (E to D is an interval of 7 notes). Immediately as bass becomes E the sopranos add the 3rd wrt bass which is G.
A harmonic chain [Piston], caries on where each woman voice group in turn prepares the 7th and the other ground adds the 3rd. Everything with respect to bass. So all those fabulous major seventh chords are prepared for the listener's brain [Bach].
https://m.youtube.com/watch?v=zEOybKIrxSk#fauxfullscreen
The same played in a less midi way:
https://m.youtube.com/watch?v=74_rHWFz-AI#fauxfullscreen
References:
Bach Bass Rules:
https://normanschmidt.net/scores/bachjs-general_bass_rules.pdf
Harmony - Piston
Comfutatis - Motzart, from film Amadeous
https://m.youtube.com/watch?v=kdBypYaEexQ#fauxfullscreen
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