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Harmonic sound is a sound produced by a triad, e.g. C, E, G or A, C, E. To create this sound on a Guitar, you use your little finger of your left hand to touch a string at the 12th fret while your right hand plucking the string.
Publishes Dang Thao's Guitar Music. There are links to the video clips of his performance on Guitar in Youtube.com. (Trang Guitar tiếng Việt: http://guitardangthao.blogspot.com.au/)