C♭dim(maj7): C♭ Diminished Major 7th Piano Chord

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♭♭	white	index finger (2)	middle finger (3)
G♭♭	white	middle finger (3)	index finger (2)
B♭	black	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:

I — C♭ Major (major)

Degree	Numeral	Chord	Quality
1	I	C♭ Major	Major
2	ii	D♭ Minor	Minor
3	iii	E♭ Minor	Minor
4	IV	F♭ Major	Major
5	V	G♭ Major	Major
6	vi	A♭ Minor	Minor
7	vii°	B♭ Diminished	Diminished

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.