There are a number of alternate guitar tunings that are commonly used, the most popular being drop-d tunings which have become almost a standard for heavy metal music. Others are commonly used for guitar like instruments such as the Dobro or Lute.
| String | 6 | 5 | 4 | 3 | 2 | 1 |
|---|---|---|---|---|---|---|
| Standard Tuning |
E | A | D | G | B | E |
| Drop D | D | A | D | G | B | E |
| D sus9 | D | A | A | G | A | E |
| DADGAD | D | A | D | G | A | D |
| Open D | D | A | D | F# | A | D |
| Open D (2) | D | G | D | G | B | D |
| DAD | D | A | D | D | A | D |
| Dobro | G | B | D | G# | B | D |
| Lute | E | A | D | F# | B | E |
