C# add9/B
The C# add9 chord consists of the C# (Perfect unison), F (Major third), G# (Perfect fifth) and D# (Major ninth) notes, with B as the bass note.

How to play the C# add9/B chord
- Play B as the lowest bass note in the left hand
- Find C# (Root) on the piano keyboard
- Add F (Major third) — 4 semitones above C#
- Add G# (Perfect fifth) — 7 semitones above C#
- Add D# (Major ninth) — 14 semitones above C#
- Press all 5 notes simultaneously to sound the C# add9/B chord