8-String guitar comes with eight strings. There are many variants of this musical instrument guitar, one maybe invented from Russia along with the 7-string guitar alternative in the 19th century. The musical instrument 8-string guitar has started gaining popularity very recently, notably among jazz artists such as Charlie Hunter, The Special Purpose, Richard Scott, and Terje Rypdal and other metal artists like Meshuggah, Korn guitarist James “Munky” Shaffer also had also been appeared with 8 string guitar during occasional live shows.

There are constantly increasing the number of online musical instrument store and musical instrument store offering 8 string guitars, and a production eight stings is been released during 2007 by Ibanez. Some of the other main manufacturing companies of 8 and also 9 strings guitars are Novax Guitars launched by Ralph Novak and Conklin Guitars.

Advantages of 8 string guitars:

•    Full range of bass notes appears from A an octave lowers than the 5th guitar string, and up to the drop-D string.
•    Latest 19-century model smaller scale and thin neck facilitates access to all 8 strings, for even Barres.
•    It has the ability to play 10-string range of Mertz, and 7-string Coste range.
•    It has the ability to play Baroque transcriptions at actual pitch.
•    It plays Baroque 8-course lute pieces from originals.
•    Play drop-D pieces with contact to the usual 6-string and drop-D fingerings.
•    Low D and A quiver understandingly with 2 open strings.
 
This period balanced 8-string guitar shaped by Reis in about 1840 is a hard surviving example of the multi-bass guitars. It is designed after the well-known Viennese builder Anton Stauffer, as many Viennese builders copied the same Stauffer's design. Note that the additional 2 strings are not fretted and they are only the open string could be played. The headstock is a usual figure 8 shape, where the gathering for the 7th and 8th strings is interlocked.

The musical instrument 8 string variations can also be found in classical nylon strung instruments. They are usually tuned with two additional basses, which differ in pitch depending on the piece being played. Another general variation is to add an additional bass and treble string. The additional treble is almost forever tuned to A, while the added bass string generally falls on A, B, or C.