Cuqin is an ancient musical instrument with a peculiar shape that is popular in Qingzhou, Shouguang, Guangrao and Linzi. It is currently only seen in Qingzhou. There is a saying among the people that "Cuoqin is Zhu". It consists of a qin top, a qin bottom, a qin head, a qin tail, a qin ridge, a qin bridge, a qin peg, a qin peg, a qin string and a qin bow. The qin top is made of a thin paulownia board and is in the shape of a bridge arch. The qin bottom is made of paulownia wood and supports the arched qin top. The qin head and qin tail are installed at both ends to form a resonance box. There is a half-moon-shaped hole at the bottom of one end of the qin head, called the qin groove, for the left hand to hold. There are 13 qin pegs in total, with double holes at the top for stringing. The strings are mostly silk strings, and the qin bow is made of the top two sections of sorghum stalks, coated with rosin, and can be used to rub or strike the strings. When playing, the left hand reaches into the half-moon-shaped hole at the bottom of the qin head, holds the qin body, and places the qin tail on the left shoulder. The right hand holds the bow to rub and strike the strings, while the left wrist rotates to drive the body of the instrument to "send the strings to meet the bow". Because rubbing the strings with rosin-coated sorghum stalks is similar to filing something, some zhuqin artists call it "filing the qin", and when writing it, it is written as "zhuqin" for simplicity and convention. The art of zhuqin is primitive and simple, with mature production technology and tuning methods. The body of the instrument is made of sycamore wood as the main material, with silk strings, and is played with sorghum stalks. It is an instrument that can be struck, pulled, and plucked. It has a complete score and various performance forms. The sound quality of the zhuqin is rough and thick in the bass area, with a slight sand sound; the middle area is elegant and soft, implicit and beautiful; the sound quality in the treble area is crisp. When playing with strings, the timbre is crisp and loud, with a unique folk flavor.