Gb maj11/D
The Gb maj11 chord consists of the Gb (Perfect unison), Bb (Major third), Db (Perfect fifth), F (Major seventh), Ab (Major ninth) and Cb (Perfect eleventh) notes, with D as the bass note.

How to play the Gb maj11/D chord
- Play D as the lowest bass note in the left hand
- Find Gb (Root) on the piano keyboard
- Add Bb (Major third) — 4 semitones above Gb
- Add Db (Perfect fifth) — 7 semitones above Gb
- Add F (Major seventh) — 11 semitones above Gb
- Add Ab (Major ninth) — 14 semitones above Gb
- Add Cb (Perfect eleventh) — 17 semitones above Gb
- Press all 7 notes simultaneously to sound the Gb maj11/D chord