Construction
C Diminished Major 7th = Root + Minor 3rd + Diminished 5th + Major 7th = C, E♭, G♭, B
| Note | Interval | Degree |
|---|---|---|
| C | Root | 1 |
| E♭ | Minor 3rd | ♭3 |
| G♭ | Diminished 5th | ♭5 |
| B | Major 7th | 7 |
Fingering
| Note | Key color | Right hand | Left hand |
|---|---|---|---|
| C | white | thumb (1) | little finger (5) |
| E♭ | black | index finger (2) | middle finger (3) |
| G♭ | black | middle finger (3) | index finger (2) |
| B | white | little finger (5) | thumb (1) |
Right hand: thumb (1) on C, index finger (2) on E♭, middle finger (3) on G♭, little finger (5) on B.
Left hand: little finger (5) on C, middle finger (3) on E♭, index finger (2) on G♭, thumb (1) on 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.
Chords in the Key of C Major
These are the triads built on each degree of C Major:
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.