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Altered

Dominant seven sharp nine sharp eleven chords

C7 with #9 and #11: C-E-G-Bb-D#-F#. Formula: 1-3-5-b7-#9-#11. Lydian dominant + altered density.

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.

  • C7#9#11
  • Db7#9#11
  • D7#9#11
  • Eb7#9#11
  • E7#9#11
  • F7#9#11
  • F#7#9#11
  • G7#9#11
  • Ab7#9#11
  • A7#9#11
  • Bb7#9#11
  • B7#9#11

Voicings

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

Rootless (3-b7-#9-#11)

E · Bb · D# · F#

expert

Brad Mehldau modern altered V

Rootless Altered Stack (b7-#9-#11-13)

Bb · D# · F# · A

expert

Rootless (#11-b7-#9-5)

F# · Bb · D# · G

expert

Octaves shown are the app's default ascending voicing.

Altered tones #11 (F#) + #9 (D#) over b7 + 5 — bass plays C

Where it turns up

Modern jazz / fusion altered V. Brad Mehldau and post-bop vocabulary.

Commonly swapped with

  • C7alt
  • C7#9
  • C7#11

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