How it works:

The system is mounted onto the back of any door.

The custom LED strip is constantly active. The LEDs display the real-time intensity of the sound in the room. 

The proximity sensor is placed on the other side of the door. (facing outside the room) 

When someone comes near the door, it triggers an LED.

Using an SD card, any song/ambient audio can be loaded onto the Arduino which plays it through any speaker connected through aux.