What is Open A tuning?
Tune to E A E A C# E so the open strings form an A major chord with E in the bass. The notes below are listed from the thick sixth string to the thin first string.
How to tune from standard
- Leave the sixth string at E2.
- Leave the fifth string at A2.
- Raise the fourth string from D3 to E3 slowly.
- Raise the third string from G3 to A3 slowly.
- Raise the second string from B3 to C#4 carefully.
- Leave the first string at E4, then recheck every string.
E A E A C# E target frequencies
| String | Note | Frequency |
|---|---|---|
| 6 | E2 | 82.41 Hz |
| 5 | A2 | 110.00 Hz |
| 4 | E3 | 164.81 Hz |
| 3 | A3 | 220.00 Hz |
| 2 | C#4 | 277.18 Hz |
| 1 | E4 | 329.63 Hz |
How it feels and sounds
The open strings spell an A major chord. Straight barres create movable major chords, while the repeating E and A notes produce strong drones for slide guitar, roots music, and spacious rhythm parts.
Setup and tuning stability
Open A increases tension compared with standard tuning, especially on the fourth, third, and second strings. Lighter gauges can reduce the increase. A lower-tension alternative is to use Open G and place a capo at the second fret, although the lowest note and voicing differ.
Practical tuning routine
Tune slowly, use a light attack, and make the final adjustment by approaching each pitch from below. After all six strings are close, repeat the pass because changing one string changes neck and bridge tension slightly. Check again after a minute of playing.