<Ul> <Li> Standard Tuning - B' - E-A-d-g-b-e' This is the Standard seven - string tuning . </Li> <Li> Drop A 7 - String Tuning - A' - E-A-d-g-b-e' This is the Standard seven - string tuning with low B dropped to A . </Li> <Li> Standard Choro Tuning - C-E-A-d-g-b-e' Standard seven - string tuning for Brazilian choro . </Li> <Li> Drop D 7 - String Tuning - B' - D-A-d-g-b-e' Standard seven - string tuning with the low E dropped to D, which results in a minor 3rd interval between the two lowest strings of B and D. Used by Ed Sloan of Crossfade . Also used by Animals as Leaders on the song "CAFO". </Li> <Li> Drop D & A 7 - String Tuning - A' - D-A-d-g-b-e' Standard seven - string tuning with a Dropped D and A from E and B. Used extensively by Dir En Grey since the album "Dum Spiro Spero" as well as the song "Obscure" from the album Vulgar . </Li> <Li> Thirds Tuning - E-G ♯ - c-e-g ♯ - c' - e' Same range as standard six - string . Allows over two full chromatic octaves without changing position, slides or bends . </Li> <Li> All Fourths Tuning - B' - E-A-d-g-c' - f' Expands the major third between the second and third strings, extending range a half step higher . </Li> <Li> Russian Tuning - D-G-B-D-g-b-d 6 - string Open G tuning with additional 5th B - string . Was a standard tuning for classic 7 - string guitars in Russia in the 19th to 20th centuries . </Li> </Ul> <Li> Standard Tuning - B' - E-A-d-g-b-e' This is the Standard seven - string tuning . </Li> <Li> Drop A 7 - String Tuning - A' - E-A-d-g-b-e' This is the Standard seven - string tuning with low B dropped to A . </Li> <Li> Standard Choro Tuning - C-E-A-d-g-b-e' Standard seven - string tuning for Brazilian choro . </Li>

What is the lowest tuning on a guitar