Abstract: Solid transparent plastic material has frosted surfaces and contains lights the rays of which are diffused by the surfaces and viewed as a solid field of luminous light. Preferably, the lights are variously colored, for example, red, blue and green, and are energized by suitable switching means to produce color fields in each of the colors and in the pastel or sum colors thereof. This color field effect is incorporated in a plastic guitar, energization of the lights therein being responsive to tone frequencies as the guitar is played, to provide a spectacular display of light and whereby the guitar player sees his music in color fields that change hue.

Abstract: A guitar containing fiber optic strands extending through the neck to conduct light from a source located in the body to fret markers on the fretted surface of the neck and the side surface facing the guitarist, thereby allowing the instrument to be played in the dark and producing a pleasing aesthetic affect.

Abstract: A rigid end plug adapter which serves both as a strap or end button and electrical connector for transducer pickups is provided in the end block of a musical instrument such as a guitar or violin-type instrument.