Mouthbow(or musical bow) is an ancient and simple string musical instrument. It consists of a string supported by a flexible stick 0.5 to 3 m long, and strung end to end with a taut cord. Usually made out of wood. Often, it is a normal archery bow used for music rather than as a weapon.
My main design consists of 2 tunable strings supported by a wooden stick, plus some additional parts, that might vary acoustics of the sound of the strings. Another design suppose to have a string strung end to end in a space between two wooden side covers.