(C-C-G-C-F-A-D) was used by James Hetfield on an ESP 7-String Guitar when Metallica we're recording the song "Some Kind Of Monster" from the album St. Anger.Drop A 7-string tuning - A'-E-A-d-g-b-e'This is the standard seven-string tuning with the low B string dropped to A.Standard Choro tuning - C-E-A-d-g-b-e'Standard seven-string tuning for Brazilian choro.Drop D + B 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". A flat variation of this tuning is used by Periphery on the song “Racecar”.Drop D + A 7-string tuning - A'-D-A-d-g-b-e'Seven-string tuning with the low E string dropped to D and a low A added below. Used extensively by Dir En Grey since the album "Dum Spiro Spero" as well as the song "Obscure" from the album Vulgar. Also used by Stam1na.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.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.Russian Tuning - D-G-B-D-g-b-d6-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. LowerA/B tuning - A'-D-G-c-f -a-d' / B'-E-A-d-g -b-e'Half a step down from standard, used by bands such as Meshuggah in their earlier days, Jeff Loomis (now formerly of Nevermore), Cannibal Corpse mid-career, Hypocrisy, Adema, American Head Charge, Sonata Arctica (since Winterheart's Guild), Mushroomhead, Korn in Neidermeyer's Mind demo album, Revocation, Dir En Grey since "Dum Spiro Spero," After The Burial, Chad Kroeger of Nickelback on the song "This Means War" (Ryan Peake used a six-string), Slayer (on War Zone and Here Comes the Pain from God Hates Us All, also "Not of This God" from World Painted Blood), Trivium from Silence in the Snow onwards and all live performances of songs previously written on standard tuned seven string guitars. Dream Theater used this tuning on "Paralyzed" from the album Distance Over Time.A tuning - A'-D-G-c-f-a-d'A full step down from standard. Used by bands such as Korn, Delain, Paradise Lost, Dream Theater (on "False Awakening Suite" and "Illumination Theory" from the self-titled album), VUUR, Obscura, ReVamp, Hypocrisy (on much of their self titled album),