Xue Fanxin's skill in music was inferior to Ye Jiushang's, but after his reminder, she more or less sensed something. Even if she was not very clear, she still did as he instructed and started to look for the source of the music.
This was clearly music played through a stereo. From the sound quality and musical instruments used, it could only be from the modern age.
That Spacetime Emperor liked to bring modern things here to show off. Presumably, the method to turn off music should be similar to those of modern sound systems.
Xue Fanxin began to search for something special in the palace while listening carefully. In the end, she realized that there was a small button on one of the pillars in the palace. There was no button on the other pillars.
This should be it, right?