Dec 12, 2020
In 1939, it was decided that the note of “A” above Middle C on the piano, would henceforth “officially” be considered to vibrate at 440 Hz, or 440 cycles per second.
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In 1939, it was decided that the note of “A” above Middle C on the piano, would henceforth “officially” be considered to vibrate at 440 Hz, or 440 cycles per second.
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