Musical tuning to the fundamental note of the unstopped, full string. The strings of a guitar are normally tuned to fourths (excepting the G and B strings in standard tuning, which are tuned to a third), as are the strings of the bass guitar and double bass. Violin, viola, and cello strings are tuned to fifths. However, non-standard tunings (called scordatura) exist to change the sound of the instrument or create other playing options. To tune an instrument, often only one reference pitch is given. This reference is used to tune one string, to which the other strings are tuned in the
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