Bb add2/Cb
The Bb add2 chord consists of the Bb (Perfect unison), C (Major second), D (Major third) and F (Perfect fifth) notes, with Cb as the bass note.

How to play the Bb add2/Cb chord
- Play Cb as the lowest bass note in the left hand
- Find Bb (Root) on the piano keyboard
- Add C (Major second) — 2 semitones above Bb
- Add D (Major third) — 4 semitones above Bb
- Add F (Perfect fifth) — 7 semitones above Bb
- Press all 5 notes simultaneously to sound the Bb add2/Cb chord