A# dominant 7th suspended 4th · Piano
A#7sus4 Chord on Piano
The A#7sus4 chord (A# dominant 7th suspended 4th) is built from the notes A#, D#, F and G#. The keyboard diagram below shows exactly which keys to press. The same chord is also written Bb7sus4; both spellings sound identical.
Chord diagrams
Notes in this chord
- A♯
- D♯
- F
- G♯
Degrees: 1 – 4 – 5 – ♭7
Also written: Bb7sus4
How to play
To play A#7sus4 on piano, press A#, D#, F 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 7sus4 chord combines the suspended fourth with a minor seventh. It delays resolution while keeping the dominant pull, which makes it a favourite setup chord before a V–I move. On A#7sus4 this structure sits on the root A#, so the degrees 1 – 4 – 5 – ♭7 map onto A#, D#, F and G#.
Frequently asked questions
- Which notes are in the A#7sus4 chord?
- A#7sus4 contains the notes A#, D#, F and G#. Relative to the root these are the degrees 1 – 4 – 5 – ♭7.
- Are A#7sus4 and Bb7sus4 the same chord?
- Yes. A#7sus4 and Bb7sus4 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.
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