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A440 is the musical note A above middle C. It has a frequency of 440 Hz, and is the most commonly applied tuning standard for musical pitch in modern music. The pitch standard is identical with A, which is the sixth note of the diatonic scale from the original key of C. A is the original key of A-minor and A-major.
Answer time 0s (0s). 19% have previously answered correct on this question. The question was created 2008-11-13.
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