What Is The Frequency Of A440?

440 Hz A440 (sometimes called A4) is the 440 Hz tone that serves as the internationally recognized standard for musical pitch. A440 is the musical note A above middle C. NIST has broadcast A440 from radio station WWV since 1936.

The Ultimate 432Hz VS 440Hz | CONSPIRACY + Comparison

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“Music Is Frequency Programming” 440HZ

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432-440Hz Cymatics Frequency experiment - tonoscope

432-440Hz Cymatics