About the C sharp diminished seven flat nine chord
C sharp diminished seven flat nine sits outside the plain diatonic set, so it is borrowed to add color and tension. Think of it as a C♯ diminished seventh flat nine chord.
Its notes are C♯, E, G, B♭, and D. The intervals are a minor third, a diminished fifth, a diminished seventh, and a minor ninth.
Also called D flat diminished seven flat nine, which spells the same notes enharmonically. In shorthand it is commonly written C#dim7(b9).
Inversions
C sharp diminished seven flat nine (root position)
Notes and intervals
| 1 | C sharp | Root |
|---|---|---|
| 2 | E | Minor 3rd |
| 3 | G | Diminished 5th |
| 4 | B flat | 7d |
| 5 | D | Minor 9th |
Shapes
Chromatic
Circle of Fifths
Other C sharp chords
Simpler triads
C sharp five chordC sharp major chordC sharp minor chordC sharp diminished chordC sharp augmented chord
Suspended
C sharp suspended two chordC sharp suspended four chordC sharp seven suspended four chordC sharp nine suspended four chordC sharp thirteen suspended four chord
Sixths and sevenths
C sharp six chordC sharp minor six chordC sharp minor flat six chordC sharp seven chordC sharp major seven chordC sharp minor seven chordC sharp minor seven flat five chordC sharp diminished seven chordC sharp minor major seven chordC sharp major seven flat five chordC sharp major seven sharp five chordC sharp minor major seven flat five chord
Extensions
C sharp nine chordC sharp add nine chordC sharp major nine chordC sharp minor nine chordC sharp eleven chordC sharp thirteen chordC sharp six nine chordC sharp minor add nine chordC sharp major eleven chordC sharp major thirteen chordC sharp minor eleven chordC sharp minor thirteen chordC sharp minor six nine chordC sharp minor major nine chordC sharp minor major eleven chord
Altered
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