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Tap harmonic is a technique used with fretted string instruments, (usually guitar). It is executed by tapping on the actual fret wire most commonly at the 12th fret, but also can be executed by tapping any of the fret wires with proper technique. It can also be done by gently touching the string over the fret wire instead of tapping the fret wire if the string is already ringing.
See also 
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