At your risk.
They can be clearly heard at 1:50.
The key is A minor, that is the first bass note is A. In the key of A minor all notes are natural, the white keys of a piano keyboard.
At chorus bass becomes F so using the simple rule 1 3 5 or 1 3 5 7 the chord is F A C or F A C E so the bass code is F or F7.
Then the harmony is G7 that is G B D F, using the Principle of Least Change in Music since the previous chords is F A C E we can play F G B D (the same trick used by Bach on the 1st prelude in C Magor from the Well Tempered Clavier for example at 1:02-1:04. The code is different but you can see the similarity of keeping the bass the same (pedal bass) in order to get from one chord to the next with the least possible note changes.
Then bass becomes A so harmony is using the simple harmonic triad code 1 3 5, that is A C E.
Then bass becomes a step down that is G. If we play harmonic code that is G B D it sounds trivial and wrong as we have parallel fifths (as Bach calls it the error in music). So again using using the Principle of Least Change in Music the composer plays G B E (E is kept from the previous chords), that is the code is G6. WIth the 6th or 7th or 9th (with respect to bass) as Bach says in his manual we add the 3rd/ So we have G B E which sounds fantastic.
It is the same chord progression as the first 2 chords of Old and Wise _ Alan Parsons Project:
F A C E
F G B D
A C E
G B E
If these are played on the left hand at the middle the keyboard of a well tuned piano and we the right hand the melody, it should sound very nice.
This is how it will be scored on The Melody Book.
Further reading:
Instructions for playing thorough bass by her Johann Sebastian Bach for his scholars in music
(It can be found at the appendix of Bach's Biography by Spita)
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