Feedback vs. Harmonics

"I'd like to give you some feedback". Words to strike terror into most people, particularly in a corporate setting.

Most feedback contains some element of "I need you to be more like......" in pursuit of something wanted by somebody else.

The return of a fraction of the output signal from an amplifier, microphone, or other device to the input of the same device; sound distortion produced by this.

Dictionary.com

We respond to this input in much the same way as the dictionary definition - with a fraction of what the person giving the feedback wants, and the result, often for both parties is similar to the feedback we get when the microphone gets too close to the speaker - a discordant shrieking of the soul and a need to get the microphone and speaker as far apart as possible.

Harmonics is different. The resonance derives from the compatibility of two elements to create something additional

An overtone accompanying a fundamental tone at a fixed interval, produced by vibration of a string, colu…