Skip to content
piano.org
A piano reference: chords, scales, theory & ear training.
/
Spotted something? Leave a note ↓

C♭ Diminished Major 7th

chord·/chords/diminished-major-7th/c-flat/

The C♭ Diminished Major 7th chord contains the notes C♭, E♭♭, G♭♭, and B♭.

Notes: C♭, E♭♭, G♭♭, B♭ · Piano keys: C♭ E♭♭ G♭♭ B♭

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

Jump to any CHORD
Piano Deck · Chord
Three quick cards on C♭ Diminished Major 7th
Answer on the keyboard, not with buttons. No login required.
C♭
C♭ – E♭♭ – G♭♭ – B♭

Practice C♭ Diminished Major 7th

Reading about it is one thing. Drilling it is what makes it automatic.

Chord Drill →Timed drills — build speed and recognitionPractice Room →Plug in a MIDI keyboard for real-time feedback

Introduction

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

Notes

Notes:C♭ – E♭♭ – G♭♭ – B♭

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.

C♭ Diminished Major 7th — Frequently Asked Questions

What is the C♭ Diminished Major 7th chord on piano?
The C♭ Diminished Major 7th chord contains the notes C♭ – E♭♭ – G♭♭ – B♭. On piano, play these notes together to sound the chord.

Related Tools

Chord FinderLook up any chord — see the notes, hear it, and play along.Chord DrillTimed drills to build speed and recognition across all chord types.Practice RoomPlug in a MIDI keyboard and get real-time feedback on every chord and scale.Circle of FifthsVisualize key relationships, relative minors, and key signatures.MIDI MonitorLive MIDI message stream with note names, velocity, and a scrolling staff.

References & Further Reading

The note names, intervals, fingering, and harmony on this chord page are grounded in the following sources. Public domain treatises and scores are linked to their full text; primary data reflects piano.org's own interval-derived dataset.

  1. 1

    Goetschius, Percy(1889)

    The Material Used in Musical Composition

    Public domain treatise
  2. 2

    Riemann, Hugo(1896)

    Harmony Simplified (English translation)

    Public domain treatise
  3. 3

    George Grove (ed.)(1900)

    A Dictionary of Music and Musicians

    Public domain treatise
  4. 4

Spot something that looks off? Use the note form below — corrections are reviewed by hand.

Leave a note

Spotted a typo, have a question, or want to add something? We read every note.

0 / 1000