Eb maj13/Bbb
The Eb maj13 chord consists of the Eb (Perfect unison), G (Major third), Bb (Perfect fifth), D (Major seventh), F (Major ninth) and C (Major thirteenth) notes, with Bbb as the bass note.

How to play the Eb maj13/Bbb chord
- Play Bbb as the lowest bass note in the left hand
- Find Eb (Root) on the piano keyboard
- Add G (Major third) — 4 semitones above Eb
- Add Bb (Perfect fifth) — 7 semitones above Eb
- Add D (Major seventh) — 11 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 maj13/Bbb chord