In music, the third factor of a chord is the note or pitch two scale degrees above the root or tonal center. When the third is the bass note, or lowest note, of the expressed triad, the chord is in first inversion Play (help·info).
Conventionally, the third is third in importance to the root and fifth, with first inversion being the second strongest inversion and the third in all primary triads (I, IV, V and i, iv, v) being variable, major or minor. In jazz chords and theory, the third is required due to it determining chord quality.
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