At-a-glance comparison
| Feature | Open G | Open A |
|---|---|---|
| Notes | D G D G B D | E A E A C# E |
| Open chord | G major | A major |
| Tension change | Mostly lower | Several strings higher |
Chord relationships
Each tuning uses root, third, and fifth notes of its major chord. Straight barres transpose the open harmony, but the exact bass voicing differs from simply placing a capo on the other tuning.
Safety and gauges
Open G is approachable on normal strings because strings are lowered. Open A raises D to E, G to A, and B to C#, so tension increases and appropriate gauges may be needed.
Playing choice
Open G is a common starting point for blues and slide because of its comfortable tension and low fifth in the bass. Open A provides brighter resonance in A without a capo.
How to choose
- Begin with Open G if you are new to open tunings.
- Choose Open A only after confirming gauges and target octaves.
- Use the exact tuning sequence required by the lesson or arrangement.
Use the capo alternative carefully
Open G with a capo at the second fret produces an A-major chord and keeps the lower-tension Open G setup, making it a useful way to test songs in A. It is not identical to the E A E A C# E Open A voicing described here: the lowest sounding note and string relationships differ. Check the exact arrangement before treating the two setups as interchangeable.