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TIL modern pianos have exactly 88 keys because any notes beyond that range fall outside the limits of human hearing and become mere rumblings or shrill clicks to our ears.
Modern pianos settle on exactly 88 keys not because 100 was too heavy, but because human hearing taps out. The standard range runs from A0 at 27.5 Hz up to C8 at 4,186 Hz. Any note lower sounds like an engine idling, and any note higher sounds like a dog whistle with no tune. More
