G♭ Diminished Major 7th

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The G♭ Diminished Major 7th chord contains the notes G♭, B♭♭, D♭♭, and F.

Notes: G♭, B♭♭, D♭♭, F · Piano keys: G♭ B♭♭ D♭♭ F

Reviewed for accuracy · Last updated July 2026 · Maintained by Justin Evans

F♯ Diminished Major 7th

This is the same chord as F♯ Diminished Major 7th — the same keys on the keyboard, spelled with sharps.

Open F♯ Diminished Major 7th What are enharmonics?

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G♭

G♭ – B♭♭ – D♭♭ – F

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Introduction

The G♭ Diminished Major 7th chord is a four-note chord made up of G♭, B♭♭, D♭♭, and F.

Notes

Notes:G♭ – B♭♭ – D♭♭ – F

Key Signature

A Diminished Major 7th chord is built from symmetrical or ambiguous intervals, so it doesn’t belong to a single key and has no key signature of its own.