Violin typically are lower in pitch than the G-string; these strings are usually tuned to C, F, and B. If the instrument's playing length, or string length from nut to bridge, is equal to that of an ordinary full-scale violin; i.e., a bit less than , then it may be properly termed a violin. Some such instruments are somewhat longer and should be regarded as violas. Violins with five strings or more are typically used in jazz or folk music. Some custom-made instruments have extra strings which are not bowed, but which sound sympathetically, due to the vibrations of the bowed
Violin family a relationship to the viol family. They point to the internal construction of the double bass, which includes a sound post and bass bar like other violin family instruments as a more weighty piece of evidence than the external features. Its origins aside, it has historically been used as the lowest member of the violin family. All string instruments share similar form, parts, construction and function, and the viols bear a particularly close resemblance to the violin family. However, instruments in the violin family are set apart from viols by similarities in shape, tuning practice and history. Violin family instruments