Construction
A♯ Diminished Major 7th = Root + Minor 3rd + Diminished 5th + Major 7th = A♯, C♯, E, G♯♯
| Note | Interval | Degree |
|---|---|---|
| A♯ | Root | 1 |
| C♯ | Minor 3rd | ♭3 |
| E | Diminished 5th | ♭5 |
| G♯♯ | Major 7th | 7 |
Fingering
| Note | Key color | Right hand | Left hand |
|---|---|---|---|
| A♯ | black | index finger (2) | little finger (5) |
| C♯ | black | middle finger (3) | ring finger (4) |
| E | white | ring finger (4) | middle finger (3) |
| G♯♯ | white | little finger (5) | index finger (2) |
Right hand: index finger (2) on A♯, middle finger (3) on C♯, ring finger (4) on E, little finger (5) on G♯♯.
Left hand: little finger (5) on A♯, ring finger (4) on C♯, middle finger (3) on E, index finger (2) on G♯♯.
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 A♯ Major
These are the triads built on each degree of A♯ Major:
A♯ Diminished Major 7th : Frequently Asked Questions
What is the A♯ Diminished Major 7th chord on piano?
The A♯ Diminished Major 7th chord contains the notes A♯ – C♯ – E – G♯♯. On piano, play these notes together to sound the chord.
What is the A# piano chord?
The A# piano chord (written A♯ Diminished Major 7th) uses the same keys: A♯ – C♯ – E – G♯♯. The # and ♯ symbols name the same black key.