D add11/B
The D add11 chord consists of the D (Perfect unison), F# (Major third), A (Perfect fifth) and G (Perfect eleventh) notes, with B as the bass note.

How to play the D add11/B chord
- Play B as the lowest bass note in the left hand
- Find D (Root) on the piano keyboard
- Add F# (Major third) — 4 semitones above D
- Add A (Perfect fifth) — 7 semitones above D
- Add G (Perfect eleventh) — 17 semitones above D
- Press all 5 notes simultaneously to sound the D add11/B chord