Also known as squelch picking, a pinch harmonic or pick harmonic is a guitar technique in which the player's thumb or index finger on the picking hand slightly catches the string after it is picked, canceling the fundamental of the string, and letting one of the overtones dominate. This results in a high pitched sound. By using string bending, a whammy bar, a wah-wah pedal, or other effects, electric guitarists are able to modulate the pitch, frequency, and timbre of pinch harmonics, resulting in a variety of sounds, the most common being a very high-pitched squeal.
Read more about Pinch Harmonic: Use in Rock and Metal, Technique
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