D# 7/D
The D# 7 chord consists of the D# (Perfect unison), G (Major third), A# (Perfect fifth) and C# (Minor seventh) notes, with D as the bass note.

How to play the D# 7/D chord
- Play D as the lowest bass note in the left hand
- Find D# (Root) on the piano keyboard
- Add G (Major third) — 4 semitones above D#
- Add A# (Perfect fifth) — 7 semitones above D#
- Add C# (Minor seventh) — 10 semitones above D#
- Press all 5 notes simultaneously to sound the D# 7/D chord