Abstract: This invention relates to a music poster which includes a sound generating system disposed in a rectangular case combined with a poster. A PC board assembly includes an insulating board and a conductive minute hand mounted thereon, and is coupled externally to a sound generator and an LED assembly. Responsive to the minute hand passing through a sound operative interval, a variety of musical sounds are generated through the sound generator, and the LED assembly is operative to produce a flashing light effect, simultaneously. When the minute hand reaches and passes through a non-effective interval, the audio-visual operation is stopped immediately. As an alternate form, the PC board assembly is replaced by a photoelectric or acoustic sensor which controls the operation of the sound generator and the LED assembly, so as to let the sound generator and the LED assembly begin to operate when people are detected as passing by the poster, by a change in light levels, or sound.