A# sus4
The A# sus4 chord consists of the A# (Perfect unison), D# (Perfect fourth) and F (Perfect fifth) notes.

How to play the A# sus4 chord
- Find A# (Root) on the piano keyboard
- Add D# (Perfect fourth) — 5 semitones above A#
- Add F (Perfect fifth) — 7 semitones above A#
- Press all 3 notes simultaneously to sound the A# sus4 chord