Jews harps
The mouth harp, also called Jew's harp, berimbau, etc, is a musical instrument idiophone small and rather simple.
It is usually made up of a metal or wooden frame (in some places in Southeast Asia this arch or armor is usually made of bamboo) with a metal tab in the middle. The shape of the entire instrument is reminiscent of a φ. The hoop is usually held in the mouth. By vibrating the central plate with the fingers, the oral cavity acts as a resonance box and amplifies the sound from said vibration, which can be modulated with vocalizations, with breath strokes and other resources. It is an ancestral and universal instrument that is found practically throughout the world.
