Bb m7
The Bb m7 chord consists of the Bb (Perfect unison), Db (Minor third), F (Perfect fifth) and Ab (Minor seventh) notes.

How to play the Bb m7 chord
- 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
- Press all 4 notes simultaneously to sound the Bb m7 chord