The worry-eater is a idiophone lamellaphone, consisting of a metal or wooden structure, widespread with various names and forms across the Indo-European continent. The most common form is folded back on itself in the shape of a horseshoe to create a free space, in the middle of which is a thin lamella of metal that on one side is fixed to the structure of the instrument and on the other is free. The resonating soundbox is formed by the oral cavity.