A# maj9/E
The A# maj9 chord consists of the A# (Perfect unison), D (Major third), F (Perfect fifth), A (Major seventh) and C (Major ninth) notes, with E as the bass note.

How to play the A# maj9/E chord
- Play E as the lowest bass note in the left hand
- Find A# (Root) on the piano keyboard
- Add D (Major third) — 4 semitones above A#
- Add F (Perfect fifth) — 7 semitones above A#
- Add A (Major seventh) — 11 semitones above A#
- Add C (Major ninth) — 14 semitones above A#
- Press all 6 notes simultaneously to sound the A# maj9/E chord