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Music Theory for Computer Musicians by Michael Hewitt

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Ninth Chords

A ninth chord contains five notes, and it is derived from adding another third to the chain of three thirds used in a seventh chord (see Figure 23.3). Ordinarily, the extra note involved would originate from the scale/mode that you are using, although, as you will see later, there are always exceptions.

Figure 23.3. Ninth chord (C maj9).

Chords of the ninth originally occurred in classical music, often resulting from the use of passing notes between ordinary triad tones. In Figure 23.4, the chord Cmaj9 appears briefly between the triads of C and F.

Figure 23.4. Cmaj9 appearing through the use of passing notes. ...

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