Overtone

Definition and stakes

William James,  Psychology: Briefer Course

“ Absolutely pure red or green or violet is never experienced, and so can never be discerned in the so-called primaries with which we have to deal: the latter consequently pass for pure.—The reader will remember how an overtone can only be attended to in the midst of its consorts in the voice of a musical instrument, by sounding it previously alone. The imagination, being then full of it, hears the like of it in the compound tone. ”
Source: Gutenberg

Portrait of Charles Wesley Emerson Charles Wesley Emerson,  Psycho Vox; or, The Emerson System of Voice Culture

“ The vocal cords act in like manner with the string described, and produce fundamental tones and overtones. In the vocal mechanism which produces the human voice, the resonant chambers are so graded in size as to correspond exactly with the fundamental note and all its overtones; therefore, an overtone as distinct from the fundamental tone is never heard, but reveals its presence only by enriching the voice. ”
Source: Gutenberg

Portrait of Henry T. Finck Henry T. Finck,  Romantic Love and Personal Beauty

“ If you leave the strings of such an instrument in a state of very loose tension, they resemble the souls of ordinary mortals not in Love: for it takes a very strong breeze to elicit any sound from them. But raise them to a higher state of tension, like the souls of lovers, and the faintest breath of air will cause them to sound in sympathetic unison all their harmonics—which is another name for overtones. ”
Source: Gutenberg

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