9
Scale degree 2
A common extension on major, minor and dominant chords.
Jazz guitar chord extensions
Add color without losing the chord's identity.
Jazz extensions sit above a seventh-chord foundation. Keep the 3rd and 7th clear, then choose a 9th, 11th or 13th that supports the harmonic context.
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Extension numbers
9, 11 and 13 continue the scale above the octave.
The numbers describe chord-scale degrees, not necessarily a requirement to include every lower chord tone.
11
Scale degree 4
Can conflict with a major 3rd depending on context.
13
Scale degree 6
A common bright color on dominant chords.
Voicing
Prioritize identity and color.
Guitar cannot comfortably stack every theoretical chord tone in one register, so omissions are normal.
3rd
Keep
Defines quality.
7th
Keep
Defines seventh-chord function.
5th
Often omit
Usually less important unless altered.
Root
Contextual
Can be supplied by bass.
Use
Choose extensions by function and melody.
The best extension is the one that supports the progression and top voice.
Maj9
Major tonic
Smooth stable color.
m9
Minor color
Adds spaciousness to m7.
13
Dominant
Strong jazz and blues color.
Altered tensions
Dominant
Increase instability before resolution.
FAQ
Quick answers about jazz chord extensions.
Use these answers as a reference, then explore the relationships interactively.
What are chord extensions in jazz?
Notes such as 9ths, 11ths and 13ths added above the basic seventh-chord structure.
Do I have to play 1, 3, 5, 7, 9, 11 and 13 in a 13th chord?
No. Guitar voicings normally omit less important tones to keep the chord playable and clear.
Which notes should I keep in an extended voicing?
The 3rd and 7th usually define the core quality and function; then include the extension you want to hear.
ChordRevelation
Move from explanation to interactive harmony.
Change the key, compare voicings, follow voice leading and see the same idea directly on the fretboard.