E b5/D#
The E b5 chord consists of the E (Perfect unison), G# (Major third) and A# (Diminished fifth) notes, with D# as the bass note.

How to play the E b5/D# chord
- Play D# as the lowest bass note in the left hand
- Find E (Root) on the piano keyboard
- Add G# (Major third) — 4 semitones above E
- Add A# (Diminished fifth) — 6 semitones above E
- Press all 4 notes simultaneously to sound the E b5/D# chord