Altered

Dominant seven flat nine flat thirteen chords

C7 with both b9 and b13: C-E-G-Bb-Db-Ab. Formula: 1-3-5-b7-b9-b13. Full harmonic-minor V color.

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.

  • C7b9b13
  • Db7b9b13
  • D7b9b13
  • Eb7b9b13
  • E7b9b13
  • F7b9b13
  • F#7b9b13
  • G7b9b13
  • Ab7b9b13
  • A7b9b13
  • Bb7b9b13
  • B7b9b13

Voicings

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

Rootless (3-b7-b9-b13)

E · Bb · Db · Ab

advanced

Inversion (b9-3-b13-b7)

Db · E · Ab · Bb

expert

Full Altered Spread

C · E · Ab · Bb · Db

expert

Octaves shown are the app's default ascending voicing.

Bill Evans ballad altered V

Where it turns up

Classic V7 of minor. Strong tension resolving to im. Bill Evans / bebop ballad vocabulary.

Commonly swapped with

  • C7alt
  • C7b9
  • Db7