B♭ Diminished Major 7th

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

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

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

A♯ Diminished Major 7th

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

Open A♯ Diminished Major 7th What are enharmonics?

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B♭

B♭ – D♭ – F♭ – A

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Introduction

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

Notes

Notes:B♭ – D♭ – F♭ – A

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.