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

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