Simple music power outage, call notification circuit

In some workplaces, generators are often used to generate electricity to meet demand during power outages. When the grid is restored, it is hoped that the standby generators will be stopped quickly to avoid waste. The picture below is a simple music power outage, caller schematic.
When the power grid is normally powered, the light-emitting diode LED1 (light-emitting diode is simply referred to as LED. A diode made of a compound of gallium (Ga) and arsenic (AS), phosphorus (P) can emit visible light when electrons and holes are combined. Therefore, it can be used to make LEDs. It can be used as an indicator light in circuits and instruments, or as a text or digital display. Phosphorus gallium arsenide diodes emit red light, gallium phosphide diodes emit green light, and silicon carbide diodes emit yellow light. The power is on and the relay is connected. At this time, K2 is placed in a, KD-9300 music integrated circuit is not triggered, and the speaker and LED2 cannot emit sound and light alarm. When the power grid is out of power, J is released, the KD-9300 is triggered, and the output music signal is amplified by the transistor 9013, and the speaker is pushed to emit a musical sound. At this time, put K2 in b to prepare for the incoming call alarm. When the call comes in, the KD-9300 is triggered again to output the music signal. At this time, K2 is placed in a to prepare for the power failure alarm.