Open G: DGDgbd
This tuning is also known as “Spanish Tuning”. Open G is similar to Open D Tuning in that both are major chord tunings with the same intervals between strings. However, these intervals are shifted one string toward the treble as compared to Open D.
You might have noticed that in standard tuning the open second, third, and fourth strings are the same three notes of a G chord: D, G, and B. To arrive at Open G, you simply need to tune the other three strings to notes of a G chord as well.
These instructions assume you are starting in Standard Guitar Tuning.
Step 1: The 6th String - D
Just like Drop D, pluck the 6th string and the 4th string together or alternating and loosen the 6th string tuning peg until the pitches are the same.
Step 2: The 5th String - G
Using the 2nd string G as a reference tone, pluck the 5th and the 2nd and loosen the 5th string tuning peg to a G.
Step 3: The 1st String - D
Since the 4th, 3rd and 2nd strings are the same notes as they are in Standard Tuning, you now only need to adjust the 1st sting to get into Open G. You can use either the 6th string D or the 4th string D as a reference. Pluck’em together or alternate (loosening the 1st string) until they are in tune.
Now you are in Open G, strum the open strings together and you hear a G Major Chord.