29: Chord Extensions
Example 29.2 Dominant seventh chords in the keys of C, G, Bb, and F.
Notice above that each measure is in a different key signature. When you
build a chord on the 5th degree of the scale in any Major key, the seventh
of V^7 will automatically be a minor seventh because of the key signature.Ninth Chords
Ninth chords have 5 chord tones: Root, third, fifth, seventh, and ninth.
As before, the quality of the chord is written in larger letters next to the
chord letter, and the extensions are written in smaller letters above and to
the right. If all you see is a “9”, the 7 is assumed. However, if you want a
Major 7th in there (remember the 7th is always minor), you must specify
it, as in the GM7,9 and the Ab+7,9 below.Example 29.3 Some ninth chords.
Other Chords
Eleventh and Thirteenth Chords
The process for these chords is very similar to what you already know.
An eleventh chord will have a root, third, fifth, seventh, ninth and
eleventh.V^7 V^7 V^7 V^7
G^7 D^7 F^7 C^7
F^9 Dmin^9 C7,9 GMaj7,9 Emin^9 Ab+7,9