True, I should have said the Egyptian usage of conventional "PI" is 22/7 , 3.14 28571428571428571428571428571
REP = repeat
Solfeggio 'seeding' extraction;
STAGE1: 285 714 285 714
STAGE2: 528 417 528 417
STAGE3: 852 174 825 174
^ above show frequency harmonic seeding and construction / geometry
I think 22 /7 is a 'fractal number' or something, and that was why it was used, it constantly repeats. Music is based on this principle in layout. But interestingly many hymns, and the original secret solfeggio of the church seems to be based on this in a rather odd unexpected way.
From 22/7 these hz for solfeggio are extrapolated
SE1= SET 1, SE2=SET 2
SE1, SE1, SE2, SE2, SE1, SE2
174, 417, 528 , 285, 741, 852 (hz where A=432hz)
As a musician with a bizarre talent JUST at writing music (im useless at sight reading, always have been even though i was clasically trained for a decade

) I can tell you I've had a sort of 'understanding' of this in composition; I believe as Pythagorean mathematics that music has geometry, as much as music has superposition - in that the way a peice of music 'moves you' - it really is a moving wave, that creates a static geometry. specifically if derived from a number like 22 /7 (which is fractal) - the question is why is fractals so important for resonance and superposition in the Solfeggio, and why did this first appear in the St. John the baptist Hymn?
Make no mistake, there is something to this, but it is an extremely complicated endeavor, it requires mathematical and spiritual qualities. I have an article on this too, if you study Mozarts Magic Flute you will see the geometry Mozart had an illicit understanding of, if anyone has an eye for musical patterns (or ear for that matter) you should study a visually scaled representation of Bach's Brandenburg concerto or Mozart's magic flute, anyone can see this geometry with the visual aid, however some can see it whilst listening, some can also see it before playing, because it is more really a fractal self referent paradox to continuously write music well, and a balance between high mathematics and artistic creation is as equal to the egyptians sophistication in the understanding between the brilliance of a good tool and a good method - and the required balance. It is interesting that such a 'balance' is mirrored in the seeding of the solfeggio frequencies. Quite a marvelous idea, and one who would say these frequencies are 'made up' and 'show me the research that links 22/7 to solfeggio' - well read some of Horrowitz' stuff, as a musician I can't possibly emphasis the importance of understanding that geometry is what music is, we just have so many cultural boxes...
Perhaps we do not need many millions of average people... but just a single genius listened to. The solfeggio was almost lost forever, but people like Mozart and members of the church did keep some of it alive (even though the church was somewhat responsible for the supressing of it).
Consider this.. What frequency do brainwaves work at beta, theta, alpha, etc- 0-14hz, isn't it? Do you know how low a pipe organ goes in a church? It's not as simple as 'that book is BS'. Anyone who thinks it is, you can trust me on that one at the very least.

Surely listening to geometrical music isn't a form of entrainment? is it? surely....
Interesting indeed
A
(just some random thoughts I had to add)
ps.
Ironic how the numbers in the 22 / 7 Egyptian pi create perfect resonance with them (physicists who don't believe me try and discredit me and Horowitz, these frequencies create extreme resonance - allegedly making even dna resonate - with alleged healing properties)
Almost as if someone way smarter than us or the Egyptians came u with it. To me maybe it is more a case of discovering whom now, rather than where. Emphasis on sets of 3 harmonics (or chords) i.e. resonance. The first created solfeggio frequencies were these, they are known in solfeggio literature as the 'main 6' , later a 7th was added.
The Main 6 frequencies of solfeggio ( I call them seeds because they are direct crypto-encoded-extrapolations) though, are extrapolated DIRECTLY in HIGHLY ORDERED geometric ways, and i feel they have powers we do not understand quite yet.
As scientists has noticed the universe appears to be fractal, many fringe physicists admit there is a 'very real' possibility we were 'sung into existence' , there are many of these fractal patterns repeated everywhere in all life and matter in the universe is made of it, perhaps someone who came up with the Solfeggio knew that the inner wisdom was there already, and not to be 'created intellectually somehow' - but to be observed, as Ralph ring says.. "You must always work with Mother Nature. Force is never necessary. The laws of the physical universe are really very simple." And when it comes to a lot of this geometry, it really is just 'all the same stuff' just being extrapolated/extracted and expressed in variant fashions, but all being of the same ether. something like that ;] ehehe