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C Diminished Major 7th

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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

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C
C – E♭ – G♭ – B

Practice C Diminished Major 7th

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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

    Jadassohn, Salomon(1883)

    A Manual of Harmony

    Public domain treatise
  2. 2

    Prout, Ebenezer(1889)

    Harmony: Its Theory and Practice

    Public domain treatise
  3. 3

    Beethoven, Ludwig van(1799)

    Piano Sonata No. 8 in C minor, Op. 13 ("Pathétique")

    Public domain score
  4. 4

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