A 3
The A 3 chord consists of the A (Perfect unison) and C# (Major third) notes.

How to play the A 3 chord
- Find A (Root) on the piano keyboard
- Add C# (Major third) — 4 semitones above A
- Press all 2 notes simultaneously to sound the A 3 chord
The A 3 chord consists of the A (Perfect unison) and C# (Major third) notes.
