B add9
The B add9 chord consists of the B (Perfect unison), D# (Major third), F# (Perfect fifth) and C# (Major ninth) notes.

How to play the B add9 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 C# (Major ninth) — 14 semitones above B
- Press all 4 notes simultaneously to sound the B add9 chord