string instrument

String instruments are musical instruments that produce sound through the vibrations of one or more strings, whose vibrations it resounds in the sounding board that they have. These ropes are under tension between two points on the instrument and make sound by scraping or rubbing the rope. 

                                               Chordal Instruments scraped or arc

Belong to this group the instruments to which it gets its sound through an arch (usually with the arch made of wood, which is the area of sieving, and a thin rope that is held tautly due to that subject to the two ends of the arc with which were rubbed into the strings), although there is also a technique of "pinch" the rope, called pizzicato. Examples of strings scraped: without frets: violin, viola, cello and double bass. With frets: viola da gamba and hurdy-gurdy. 

                                                Stringed Instruments down
     

            In this group belong the instruments that dot in the strings with the so-called "uneta", which is usually made of plastic (although there are also copies of wood), elongated shape and clamped with two fingers to produce the vibration of the strings by scraping off of these. 

 These are some classes of types of instruments and all separated by categories.