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Altered

Dominant thirteenth, flat nine chords

C13 with b9: C-E-G-Bb-Db-F-A. Formula: 1-3-5-b7-b9-11-13. Half-whole diminished sound.

In every key

The same shape, moved. The symbols below are spelled the way the app spells them, which is the spelling the chord's own scale asks for rather than whichever accidental is easier to type.

  • C13b9
  • Db13b9
  • D13b9
  • Eb13b9
  • E13b9
  • F13b9
  • F#13b9
  • G13b9
  • Ab13b9
  • A13b9
  • Bb13b9
  • B13b9

Voicings

Written in C, because that is the key the encyclopedia authors them in; every one transposes unchanged.

Rootless (3-b7-b9-13)

E · Bb · Db · A

advanced

Bill Evans b9-13 hybrid altered V

Inversion (b7-b9-3-13)

Bb · Db · E · A

advanced

Cluster Top (13-b7-b9-3)

A · Bb · Db · E

expert

Octaves shown are the app's default ascending voicing.

Upper Structure VI (A) (b9-3-13)

C# · E · A

advanced

RH 1-2-5 spanning C#-E-A; the wider span gives an open ring — keep wrist relaxed.

Where it turns up

Bebop V7 of minor with maximum color. Common in modern jazz comping.

Commonly swapped with

  • C7b9
  • C7alt
  • C13

The PDF book

The Ultimate Jazz Piano Voicings and Chord Atlas

From shells to advanced voicings. A practice book first, with all the theory you need explained in plain words.

  • 7 levels of voicings for every ii‑V‑I chord, from shells to quartal and upper-structure color
  • A 30-day plan and a 12-week schedule, 15 minutes a day
  • A PDF you download and keep, no subscription

See inside the book