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Music Theory for Computer Musicians by Michael Hewitt

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Chords of the Thirteenth

Thirteenth chords represent the most complex harmonies available within a seven-toned format (see Figure 23.17). This is because the introduction of a fifteenth would bring you back to the root. Thirteenth chords theoretically involve all seven notes of the scale.

Figure 23.17. Chord of the dominant thirteenth (C13).

The central problem with a thirteenth chord is what to leave in and what to leave out. The most essential elements are the root, the seventh, and the thirteenth. This not only reduces the chord to its most essential format, but it also shows the principal job of the dominant thirteenth ...

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