Light organ

A light organ is an electronic device which automatically converts an audio signal (such as music) into rhythmic light effects. In the 1970s, light organs were a popular lighting effect used in discotheques and dance parties; and also during that period, the home entertainment manufacturer Morse-Electrophonic produced some of their stereo systems with a built-in light organ display (such as their "Stereo Bar"). The multicolored lights of the light organ would pulsate to the beat of the music.