A# suspended 4th · Piano
A#sus4 Chord on Piano
The A#sus4 chord (A# suspended 4th) is built from the notes A#, D# and F. The keyboard diagram below shows exactly which keys to press. The same chord is also written Bbsus4; both spellings sound identical.
Chord diagrams
Notes in this chord
- A♯
- D♯
- F
Degrees: 1 – 4 – 5
Also written: Bbsus4
How to play
To play A#sus4 on piano, press A#, D# and F 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
Suspended fourth chords replace the third with a fourth, so they sound unresolved on purpose. Releasing the fourth back down to the third is one of the oldest and most satisfying moves in songwriting. On A#sus4 this structure sits on the root A#, so the degrees 1 – 4 – 5 map onto A#, D# and F.
Frequently asked questions
- Which notes are in the A#sus4 chord?
- A#sus4 contains the notes A#, D# and F. Relative to the root these are the degrees 1 – 4 – 5.
- Are A#sus4 and Bbsus4 the same chord?
- Yes. A#sus4 and Bbsus4 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#sus4 on your phone
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