Abstract: An optoelectronic sound amplifier system for musical instruments such as guitars, drums and the like, which includes light reflecting means positioned on the surface of the musical instrument adapted to vibrate responsive to the musical vibrations of the instrument. Light rays originating from a remote source strike the vibrating reflecting means and are modulated thereby in accordance with the musically induced vibrations of the reflecting means. The reflected and modulated light rays are received at a station remote from the musical instrument within which the rays strike a photo-electric transducer device. The photo-electric device produces an electronic signal corresponding to the musical tones associated with the modulated light rays which may then be amplified through one or more conventional amplifier-speaker units.