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
Eight-string guitar EP "Decline & Fall". Guitarist Lucas Mann and Miles Dimitri Baker from the technical deathcore band Rings Of Saturn also using eight-string guitar, as well as their former member, Joel Omans. Eight-string guitar An eight-string guitar is a guitar with two more strings than the usual six, or one more than the Russian guitar's seven. Eight-string guitars are less common than six and seven-string guitars, but they are used by a few classical, jazz, and metal guitarists. The eight-string guitar allows a wider range, or non-standard tunings (such as major-thirds tuning), or both. Various non-standard guitars were made in the