D# add9
The D# add9 chord consists of the D# (Perfect unison), G (Major third), A# (Perfect fifth) and F (Major ninth) notes.

How to play the D# add9 chord
- Find D# (Root) on the piano keyboard
- Add G (Major third) — 4 semitones above D#
- Add A# (Perfect fifth) — 7 semitones above D#
- Add F (Major ninth) — 14 semitones above D#
- Press all 4 notes simultaneously to sound the D# add9 chord