1. Tune your 6th (low E) string down two whole steps to D.
2. Tune your 5th (A) string down two whole steps to G.
3. Leave your 4th (D) string as it is.
4. Tune your B string up two whole steps to D.
5. Tune your 2nd (G) string down one whole step to F#.
6. Tune your 1st (high E) string down two whole steps to D.
Open G Tuning:
1. Tune your 6th (low E) string down one whole step to D.
2. Leave your 5th (A) string as it is.
3. Leave your 4th (D) string as it is.
4. Tune your 3rd (G) string down two whole steps to D.
5. Leave your 2nd (B) string as it is.
6. Tune your 1st (high E) string up one whole step to G.
C6 Tuning:
1. Leave your 6th (low E) string as it is.
2. Leave your 5th (A) string as it is.
3. Tune your 4th (D) string up one whole step to E.
4. Tune your 3rd (G) string up one whole step to A.
5. Leave your 2nd (B) string as it is.
6. Tune your 1st (high E) string up two whole steps to G.
Double Drop D Tuning:
1. Tune your 6th (low E) string down one whole step to D.
2. Tune your 5th (A) string down two whole steps to G.
3. Tune your 4th (D) string down one whole step to C.
4. Leave your B string as it is.
5. Leave your 2nd (G) string as it is.
6. Leave your 1st (high E) string as it is.