Eb m13/B
The Eb m13 chord consists of the Eb (Perfect unison), Gb (Minor third), Bb (Perfect fifth), Db (Minor seventh), F (Major ninth) and C (Major thirteenth) notes, with B as the bass note.

How to play the Eb m13/B chord
- Play B as the lowest bass note in the left hand
- Find Eb (Root) on the piano keyboard
- Add Gb (Minor third) — 3 semitones above Eb
- Add Bb (Perfect fifth) — 7 semitones above Eb
- Add Db (Minor seventh) — 10 semitones above Eb
- Add F (Major ninth) — 14 semitones above Eb
- Add C (Major thirteenth) — 21 semitones above Eb
- Press all 7 notes simultaneously to sound the Eb m13/B chord