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

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