As significant harmonics lessen in number and intensity, the sound becomes darker.
The ear hears fewer overtones. The edginess of the sound lessens. I believe that this is because
upper end harmonics are actually very close in pitch and create dissonances in the
tone even if it is well tuned and producing a characteristic sound. I conjecture that
what makes this different than a poor tone quality is that the dissonance is regular,
expected, and is still within the harmonic system that we all learn at a very young
age to expect and interpret at a single pitch.
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