A# dominant 7th flat 5 · Piano
A#7♭5 Chord on Piano
The A#7♭5 chord (A# dominant 7th flat 5) is built from the notes A#, D, E and G#. The keyboard diagram below shows exactly which keys to press. The same chord is also written Bb7♭5; both spellings sound identical.
Chord diagrams
Notes in this chord
- A♯
- D
- E
- G♯
Degrees: 1 – 3 – ♭5 – ♭7
Also written: Bb7♭5
How to play
To play A#7♭5 on piano, press A#, D, E and G# together. In root position the lowest note is A#, and the finger numbers follow the keys left to right in the diagram.
Theory behind the chord
The 7♭5 chord lowers the fifth of a dominant seventh, thinning out the chord and sharpening its tension. It shows up in jazz and in altered dominant sounds heading towards a resolution. On A#7♭5 this structure sits on the root A#, so the degrees 1 – 3 – ♭5 – ♭7 map onto A#, D, E and G#.
Frequently asked questions
- Which notes are in the A#7♭5 chord?
- A#7♭5 contains the notes A#, D, E and G#. Relative to the root these are the degrees 1 – 3 – ♭5 – ♭7.
- Are A#7♭5 and Bb7♭5 the same chord?
- Yes. A#7♭5 and Bb7♭5 are enharmonically identical — the spelling differs but the frets and keys are the same. Which name is used depends on the key of the piece.
Practise A#7♭5 on your phone
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