Abstract: A stringed instrument is equipped with an electrical conductor electrically connected to the frets mounted in the fretboard of said stringed instrument. Said stringed instrument is also equipped with a power source, light emitting members in electrical contact with the strings of the instrument (in one embodiment light emitting diodes) and electrical conductors electrically connecting together the components of the invention. By means of pressing down anyone of the strings capable of transmitting electric current against anyone of the frets capable of transmitting electric current connected to the electrical circuit comprised of said electrical components, said circuit closes and the light emitting member(s) associated with the string that is pressed down against the fret is lit. Preferably each string of the stringed instrument has at least one specific light emitting member connected to it.