(i.e., add2 chords), and added sixth chords (i.e., add6 chords). To identify the root of such a chord, identify the triad that has been modified and then find its root.

History

The first mentions of the relation of inversion between triads appears in Otto Sigfried Harnish's Artis musicae (1608), which describes perfect triads in which the lower note of the fifth is expressed in its own position, and imperfect ones, in which the base (i.e., the root) of the chord appears only higher.

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