Unit 16 · Extended and altered harmony · Lesson 1 of 4
Ninths, elevenths, thirteenths
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Beyond the seventh
Keep stacking 3rds above a and you reach the : the 9th, 11th, and 13th (the 2nd, 4th, and 6th, an up).
- C9 = C7 + D. Cmaj9 = Cmaj7 + D. Cm9 = Cm7 + D.
- C13 usually leaves out the 11th, which clashes with the 3rd.
Jazz players rarely play every — the 3rd, 7th, and the colour tone carry the sound.
Chord builder