Violin completely losing tension. A violin in which the tuning pegs are slipping needs to be repaired by a luthier or violin repairperson. Peg dope or peg compound, used regularly, can delay the onset of such wear, while allowing the pegs to turn smoothly. The tuning G–D–A–E is used for most violin music, both in Classical music, jazz and folk music. Other tunings are occasionally employed; the G string, for example, can be tuned up to A. The use of nonstandard tunings in classical music is known as "scordatura"; in some folk styles, it is called "cross tuning". One famous example
Violin comparable to that of fine full size violins. 5 String violin sizes may differ from the normal 4 string. The instrument which corresponds to the violin in the violin octet is the mezzo violin, tuned the same as a violin but with a slightly longer body. The strings of the mezzo violin are the same length as those of the standard violin. Violins are tuned by turning the pegs in the pegbox under the scroll, or by adjusting the "fine tuner" screws at the tailpiece. All violins have pegs; fine tuners (also called "fine adjusters") are optional. Most fine tuners