A piano has 88 keys, and each key has a different frequency. The standard pitch tuning is A4 (the A above middle C). Consecutive notes differ in frequency by the ratio of the twelfth root of 2, that is:
Click or drag on the piano below to see the name and frequency of each note and to see those notes plotted on a score sheet. The note with frequency 261.6 Hz is middle C.
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