C Diminished 7th

Cdim7

chord

At a Glance

Notes	C	Eb	Gb	Bbb
Degree Labels	R	b3	b5	bb7

Piano

Fretboard

What It Is

A diminished triad plus a diminished seventh above the root - four minor thirds stacked, dividing the octave evenly. Notes: C, Eb, Gb, Bbb.

Maximally unstable and symmetrical; can resolve in multiple directions.

Not found in any of the seeded progressions or cadences.

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