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G♭ Diminished Major 7th

Diminished Major 7th · G♭ – B♭♭ – D♭♭ – F

The G♭ Diminished Major 7th chord (G♭dim(maj7)) contains the notes G♭, B♭♭, D♭♭, and F. Its interval formula is 1 ♭3 ♭5 7. A diminished triad with a major 7th — rare and unstable, used for chromatic color in jazz.

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

At the keyboard

Gb · Bbb · Dbb · F
Maintained by Justin Evans, a pianist of 25 years
Maintained for accuracy · Last updated July 2026 · How we review
Flashcards · Chord
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G♭

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

Construction

G♭ Diminished Major 7th = Root + Minor 3rd + Diminished 5th + Major 7th = G♭ · B♭♭ · D♭♭ · F
NoteIntervalDegree
G♭Root1
B♭♭Minor 3rd♭3
D♭♭Diminished 5th♭5
FMajor 7th7

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.

G♭ Diminished Major 7th — Frequently Asked Questions

What is the G♭ Diminished Major 7th chord on piano?
The G♭ Diminished Major 7th chord contains the notes G♭ – B♭♭ – D♭♭ – F. 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 is piano.org's own interval-derived reference dataset — continuously maintained and human-verified, with no fixed publication date.

  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

    Schubert, Franz(1827)

    Impromptu in G♭ major, Op. 90 No. 3 (D. 899)

    Public domain score
  4. 4

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