Solfeggio frequencies: where they come from and what the evidence says
Where the Solfeggio frequencies really come from, from Guido d’Arezzo to a 1999 book, and what the few small studies on 528 Hz actually tested.
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432 Hz vs 440 Hz: history, myths and evidence
Why concert pitch is 440 Hz, what Verdi really said about 432 Hz, and what the few small studies on 432 Hz music actually found. An honest look.
