Abstract: An acoustical instrument designed to promote and enhance the production of musical overtones is disclosed. The instrument is capable of reinforcing, and thereby enhancing, the resonance of naturally produced musical overtones and can be adjusted to fine tune the overtone frequency of the instrument to ambient atmospheric conditions. Adjustment baffles within the tone box of the instrument enable the user to change or adjust the wavelength of the music produced by the instrument to more closely coincide with the overtone transmission capability of the ambient environment. Strings of specific length, diameter and placement are used to achieve optimal production, enhancement and transmission of overtones with the device.