PIANO KEYBOARD
The number beside each key is the fundamental frequency in units of cycles per seconds, or Hertz.
OCTAVES
For example, the A4 key has a frequency of 440 Hz.
Note that A5 has a frequency of 880 Hz. The A5 key is thus one octave higher than A4 since it has
twice the frequency.
OVERTONES
An overtone is a higher natural frequency for a given string. The overtones are “harmonic” if each occurs at
an integer multiple of the fundamental frequency.
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