The guitar is a plucked string instrument consisting of a wooden box, a neck on which is attached the fretboard, an acoustic sound hole in the center and six strings. The fretboard is embedded with metal frets that allow the different notes. This instrument is known as classical or Spanish guitar.
The mandolin is a musical instrument with four double strings and a soundboard which can be concave or flat. It is of Italian origin and has been used by many great classical and modern composers both in traditional music as well as in other music styles.
The violin is a bowed string instrument with four strings tuned in perfect fifths. It consists of a sounding board of an elegant ergonomic shape. It comprises two upper bouts, two lower bouts, and two concave bouts at the waist, providing clearance for the bow. The back and ribs are typically made of maple.