The C 7♭9♯11 chord is a six-note chord made up of C, E, G, B♭, D♭, and F♯. It is built from a root, major third, perfect fifth, minor seventh, minor ninth, and augmented eleventh.
Construction
C 7♭9♯11 = Root + Major 3rd + Perfect 5th + Minor 7th + Minor 2nd + Diminished 5th = C · E · G · B♭ · D♭ · F♯
| Note | Interval | Degree |
|---|---|---|
| C | Root | 1 |
| E | Major 3rd | 3 |
| G | Perfect 5th | 5 |
| B♭ | Minor 7th | ♭7 |
| D♭ | Minor 2nd | ♭9 |
| F♯ | Diminished 5th | ♭5 |
Key Signature
A chord has no key signature of its own, but the C 7♭9♯11 is the tonic (I) chord of C Major, whose key signature has no sharps or flats.
Chords in the Key of C Major
These are the triads built on each degree of the C major scale:
Same Notes, Other Names
The notes C – E – G – B♭ – D♭ – F♯ aren’t exclusive to this chord. Depending on which note is the bass and how the chord functions, the same pitches also spell:
C 7♭9♯11 — Frequently Asked Questions
What is the C 7♭9♯11 chord on piano?
The C 7♭9♯11 chord contains the notes C – E – G – B♭ – D♭ – F♯. On piano, play these notes together to sound the chord.
What notes are in the C 7♭9♯11 chord?
The C 7♭9♯11 chord (C7♭9♯11) contains 6 notes: C, E, G, Bb, Db, F#. Formula: R-M3-P5-m7-m9-A11.
How is C7♭9♯11 used in music?
C7♭9♯11 is used in jazz, fusion, and contemporary music to add harmonic color. It appears as a dominant or tonic chord depending on context.
What is the scale degree formula for C7♭9♯11?
C7♭9♯11 uses scale degrees 1-3-5-b7-b9-#11, giving it its distinctive sound.