Bb add13
The Bb add13 chord consists of the Bb (Perfect unison), D (Major third), F (Perfect fifth) and G (Major thirteenth) notes.

How to play the Bb add13 chord
- Find Bb (Root) on the piano keyboard
- Add D (Major third) — 4 semitones above Bb
- Add F (Perfect fifth) — 7 semitones above Bb
- Add G (Major thirteenth) — 21 semitones above Bb
- Press all 4 notes simultaneously to sound the Bb add13 chord