The mouth harp, also known as a jaw harp or Jew's harp, is a small musical instrument played by holding it against the mouth and plucking a metal tongue with the fingers. This creates a vibrating sound that can be modulated by changing the shape of the mouth and the position of the tongue. It is often made of metal or bamboo and comes in various sizes and designs. Mouth harps have a long history and are found in many cultures around the world, including Asia, Europe, and North America. They are typically used in folk music and can produce a range of sounds, making them popular for both solo performances and accompaniment.