Technique
Harmonics are mainly generated manually by different playing techniques. Another method is sound wave feedback of a guitar amplifier at high volume, which causes an "infinite" vibration of certain string harmonics. A third method, magnetic string drivers like the EBow, can generate string harmonics.
Harmonics are most often played by lightly placing a finger on a string at a nodal point of one of the overtones at the moment when the string is driven. The finger immediately damps all overtones that do not have a node near the location touched. The lowest-pitch overtone dominates the resulting sound.
Read more about this topic: Guitar Harmonics
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