D add13/D#
The D add13 chord consists of the D (Perfect unison), F# (Major third), A (Perfect fifth) and B (Major thirteenth) notes, with D# as the bass note.

How to play the D add13/D# chord
- Play D# as the lowest bass note in the left hand
- Find D (Root) on the piano keyboard
- Add F# (Major third) — 4 semitones above D
- Add A (Perfect fifth) — 7 semitones above D
- Add B (Major thirteenth) — 21 semitones above D
- Press all 5 notes simultaneously to sound the D add13/D# chord