What is a Cdim7 Chord?

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Cdim7

Cdim7 Diminished 7th

String-by-String

E
×
A
3
D
1
G
2
B
1
e
2

Cdim7 Diminished 7th is a diminished seventh chord with the root C, minor third D#, diminished fifth F#, and diminished seventh A. Its symmetric structure makes it a powerful chromatic connector.

Intervals

RootMinor 3rdDiminished 5thMajor 6th

Notes

CD#F#A

Why does Cdim7 sound dramatic and chromatic?

The Cdim7 Diminished 7th chord gets its dramatic and chromatic character from the combination of its root, minor 3rd, diminished 5th, major 6th. The specific intervals between the notes C, D#, F#, Acreate the harmonic tension and color that define this chord's unique sonic signature.

How to use Cdim7?

Cdim7 is commonly used in progressions across many genres. Try substituting it where you would normally play a standard C chord for added harmonic interest. It pairs well with other chords in the key of C and can serve as both a foundation and a color chord depending on the context.