https://twetch.app/t/dcd96566b17c3767b02bdf054697aecf925e44…

https://twetch.app/t/dcd96566b17c3767b02bdf054697aecf925e44c2a89e51173158b8e2af20132d
Together they form the harmonic series. Overtones which are perfect integer multiples of the fundamental are called harmonics.