One of the finest examples on earth.
It shows possibly the height of what can be done with prepared dissonant intervals which sound beautiful and out of the earth for the simple reason that the listener's brain is prepared [Bach, Niedt].
The principle of least change in music is used as one chord morphs to the next by changing few notes at a time.
But let's hear or play in practice.
Reading from the transposed A. Gutheil - Boosey & Howkes edition in A minor for medium height voice.
Bass A and A C E (tenor voice begins C B C...)
Bass G and A C E (just like Moonlight sonata - Beethoven)
Bass F and A C E (F maj3 maj7 so much used by Pink Floyd)
Bass F and A B D (morphing begins)
Bass F and G B D (morphing continues)
Bass E and G B D
Bass E and G A C (new preparation for our brain)
Bass D and F A C
Bass C and E A C (C6)
etc
It is amazing how each chord is made to melt into the next.
The vocal at some points in time is creating additional clusters of nearby notes. It is best to read the score, sing and slowly play along in order to study.
See also:
Bach Bass Rules - Bach, Neidt
The ordinal key is in C sharp minor
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