An overtone is the same as a harmonic. For example, a sound played on a piano will have a fundamental frequency and this frequency will be the basis for the harmonic series as it is also the first harmonic. After the first harmonic which is the fundamental, there is a second harmonic and this is called the first overtone. This can continually repeat in the harmonic series as the third harmonic is called the second overtone and so-on.

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