Probably the best known instrument among the string instruments. Based on the fiddle from the Middle Ages, the violin has established itself as an absolute must in every orchestra as well as in folk music. Well-known musicians such as David Garrett and Lindsay Stirling show that the violin, despite its long history, is still firmly established in today's music. The structure of the instrument has hardly changed since the probably most famous instrument maker Antonio Stradivari, whose name is known to every musician to this day. A violin has 4 strings tuned in fifths (g/d/a/e). The body of the instrument consists of top, back and sides, for which the same wood is mostly used, as e.g: maple, cherry, or walnut. The neck is glued directly to the body and is preferably equipped with an ebony fingerboard which due to its hardness is a very durable and stable wood. The most striking features are the snail at the upper part of the neck, to which the tuning pegs are attached, and the striking F-shaped sound holes. Between the two F-holes the bridge is loosely placed over which the strings run to the tailpiece, which is made of the same material as the fretboard. In addition to each violin you need a bow, a shoulder rest and rosin. The bow is, besides the instrument itself, the most important accessory for playing the violin. It consists of the bow stick, horsehair and the so-called frog. The frog is the part of the bow to which the horsehair is attached, which is tensioned by operating the adjusting screw and then stroked over the strings. To make the strings sound the rosin is applied to the horsehair. The horsehair dissolves over time and wears out. So if a hair comes off, it is not bad, because you have to string the bow again regularly. The big sister of the violin and differs mainly in size and tuning. The instrument can produce a lower tone due to its size. The tuning is also in fifths (c/g/d‘/a‘). To this day, violas are often integrated into classical music as lower-sounding instruments.