Wheeled instruments are musical devices that produce sound through the use of a wheel mechanism. These instruments typically consist of a wheel that is turned, creating friction against strings or other materials to generate sound. Common examples include the hurdy-gurdy and the wheel fiddle, which have been used in various musical traditions around the world. The design of wheeled instruments allows for continuous sound production, making them unique compared to traditional string or wind instruments. The player can control the pitch and volume by adjusting the tension of the strings or the speed of the wheel, offering a distinctive playing experience.