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What does “A-440” mean?

Sound occurs when air is set into motion rapidly. Humans can hear sound if those cycles of compression and decompression occur anywhere from twenty times each second to about twenty thousand times each second.

When a piano string is set into motion, it vibrates up and down repeatedly. If the note A above middle C is properly tuned, that string will vibrate 440 times in one second. That’s what A-440 means.