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C♯ Diminished Major 7th

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

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

D♭ Diminished Major 7th
This is the same chord as D♭ Diminished Major 7th — the same keys on the keyboard, spelled with flats.
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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

    Riemann, Hugo(1896)

    Harmony Simplified (English translation)

    Public domain treatise
  2. 2

    George Grove (ed.)(1900)

    A Dictionary of Music and Musicians

    Public domain treatise
  3. 3

    Beethoven, Ludwig van(1802)

    Piano Sonata No. 14 in C♯ minor, Op. 27 No. 2 ("Moonlight"), i

    Public domain score
  4. 4

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