TODO_UNIQUE_COPY — 400+ words. Cover the Horowitz "Healing Codes" lineage that put 528 Hz on the cultural map, the actual published research (or lack thereof), and the A4 = 444.04 reference for shifting C5 to 528. Be honest about what is empirically supported vs. tradition.
The science
How 528 Hz retuning actually works
Honest, technical answers — including the conversion math, the A4 reference, and what we are and aren't claiming.
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One-time. 528 Hz plus all 9 solfeggio tunings (174, 285, 396, 417, 528, 639, 741, 852, 963).
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The other tunings
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