A ninth chord is created by adding a ninth to a seventh chord.

The most common ninth chords are built on the dominant degree in minor keys as well as in major keys. Since the ninth formed is major in major keys and minor in minor keys, those chords are called major dominant ninths and minor dominant ninths.

Major Ninth
Major Ninth

Minor Ninth
Minor Ninth

 

Ninth chords may also be built on minor sevenths and major sevenths:

Minor Seventh with Ninth
Minor Seventh with Ninth

Major Seventh with Ninth
Major Seventh with Ninth

 

The augmented ninth chord is obtained by adding an interval of augmented ninth to a dominant seventh chord. In many occasions, the ninth interval is simplified enharmonically. In these cases, the chord seems to be a dominant ninth chord with a major and minor third:

Augmented Ninth
Augmented Ninth

 

We find an augmented ninth chord in Chopin's Prelude 4:

Chopin

See C > Chord for related entries.




    
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This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.
José Rodríguez Alvira.