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C♯dim7/B♭ guitar shapes

Popular fretboard positions with fingering suggestions

Showing 8 of 40 playable shapes

About the chord

C♯ diminished 7th / B♭ (3rd inversion)

The C♯ diminished 7th diminished 7th chord extends the diminished triad with a double-flatted seventh B♭, creating a haunting, symmetrical dissonance. Its ambiguous, tension-filled sound is ideal for dramatic resolutions, suspenseful scenes, or mysterious soundscapes in classical and cinematic compositions. With B♭ in the bass, this voicing functions as the 3rd inversion of C♯ diminished 7th.

Root note: C♯
Bass note: B♭
Chord tones: 4
Playable shapes: 40

Chord tones

C♯EGB♭

Notes & Intervals

Each note below shows how the chord is built from its root. This is the theory layer underneath the fretboard shapes.

C♯ Unison (Root) 1

The root anchors the chord and defines its tonal center.

E Minor Third ♭3

This note supplies the minor color and gives the chord its darker emotional pull.

G Diminished Fifth ♭5

The flattened fifth adds tension and a restless, unstable edge.

B♭ Diminished Seventh ♭♭7

The diminished seventh heightens instability and gives the chord a tense symmetrical quality.

Related Articles

Articles that reference this chord and explain how to use it in your playing.