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In music or music theory, a triad is a tonal or diatonic tertian trichord. In other words, a chord with three notes, built from thirds, and a diatonic function. The three notes are called the root, third, and fifth (a third above the third). The function is determined primarily by the root, but also by the quality of the chord (the exact third and fifth). The major chord, minor chord, diminished chord, augmented chord are all triads.
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