Seven-string guitar string is augmented with a high octave string. Many of McGuinn's notable guitar solos utilize the G string of the twelve-string guitar to perform the main melody, and therefore the Martin seven-string guitar was designed to achieve this extended range playing without the need for doubling all six of the guitar's strings. In 2010, Inox Guitars has created a mix of the Brazilian Viola caipira and the Russian semistrunka (семиструнка). This instrument has 2 bass strings (as the 6th and 7th strings of the semistrunka) and five treble courses (as the Viola caipira) and it is used in open tuning
Terz guitar guitar tuning on standard scale length guitars at normal string tension. At the 2018 NAMM Show, Reverend Guitars launched an electric Terz guitar in production along with Billy Corgan. Terz guitar Terz guitar (Terz meaning third) refers to either a small sized classical guitar or to the practice of tuning a standard guitar a minor third higher than standard guitar tuning (as though a capo were on the third fret of the guitar). The scale length is generally 530 mm (20.8 inches), though sometimes as long as 560 mm (22 inches). Mauro Giuliani and Caspar Joseph Mertz wrote extensively for