Bb m9/A
The Bb m9 chord consists of the Bb (Perfect unison), Db (Minor third), F (Perfect fifth), Ab (Minor seventh) and C (Major ninth) notes, with A as the bass note.

How to play the Bb m9/A chord
- Play A as the lowest bass note in the left hand
- Find Bb (Root) on the piano keyboard
- Add Db (Minor third) — 3 semitones above Bb
- Add F (Perfect fifth) — 7 semitones above Bb
- Add Ab (Minor seventh) — 10 semitones above Bb
- Add C (Major ninth) — 14 semitones above Bb
- Press all 6 notes simultaneously to sound the Bb m9/A chord