B maj9
The B maj9 chord consists of the B (Perfect unison), D# (Major third), F# (Perfect fifth), A# (Major seventh) and C# (Major ninth) notes.

How to play the B maj9 chord
- Find B (Root) on the piano keyboard
- Add D# (Major third) — 4 semitones above B
- Add F# (Perfect fifth) — 7 semitones above B
- Add A# (Major seventh) — 11 semitones above B
- Add C# (Major ninth) — 14 semitones above B
- Press all 5 notes simultaneously to sound the B maj9 chord