Mandolin, a plucked stringed instrument, has a bright and slender tone. It is a stringed instrument similar to and closely related to the lute. Mandolin is a small stringed instrument, which is similar in shape to a lute. When playing, a plastic pick is usually used to pluck the strings to make sound. Pear-shaped piano body has tortoise-shell pattern, and the curved back version is supported by several sound beams. Generally, it has four strings or four groups of strings, and the tuning is consistent with the violin. Mandolin usually appears as a solo instrument. Popular in southern Italy, Europe, America and Asian countries.