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
Muhammed Suiçmez Putrefaction" was released on Noise Solution Records (1999). Following the breakup of Necrophagist, Suiçmez currently works as an engineer at BMW. Suiçmez has 3 Custom Ibanez Xiphos guitars, one of which is a 7 string. His first guitar has reverse sharktooth inlays. His second custom (7 string) has a "Necrophagist" inlay on the fretboard. For most Necrophagist recordings Suiçmez is tuned in D standard (ADGCFAD for seven strings, DGCFAD otherwise). Suiçmez also had a 27 fret 7 string custom Ibanez, as seen on photos on his band's MySpace, but it was ruined when someone mishandled it backstage after a show.