About the C augmented seven flat nine chord
C augmented seven flat nine sits outside the plain diatonic set, so it is borrowed to add color and tension. Think of it as a C augmented seventh flat nine chord.
Its notes are C, E, G♯, B♭, and D♭. The intervals are a major third, an augmented fifth, a minor seventh, and a minor ninth.
Inversions
C augmented seven flat nine (root position)
Notes and intervals
| 1 | C | Root |
|---|---|---|
| 2 | E | Major 3rd |
| 3 | G sharp | Augmented 5th |
| 4 | B flat | Minor 7th |
| 5 | D flat | Minor 9th |
Shapes
Chromatic
Circle of Fifths
Other C chords
Simpler triads
Suspended
C suspended two chordC suspended four chordC seven suspended four chordC nine suspended four chordC thirteen suspended four chord
Sixths and sevenths
C six chordC minor six chordC minor flat six chordC seven chordC major seven chordC minor seven chordC minor seven flat five chordC diminished seven chordC minor major seven chordC major seven flat five chordC major seven sharp five chordC minor major seven flat five chord
Extensions
C nine chordC add nine chordC major nine chordC minor nine chordC eleven chordC thirteen chordC six nine chordC minor add nine chordC major eleven chordC major thirteen chordC minor eleven chordC minor thirteen chordC minor six nine chordC minor major nine chordC minor major eleven chord
Altered
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