The theatre inside the temple dedicated to Zhou Gong, an early Zhou philosopher, in the west of Shaanxi Province. On the right is a row of stone qins, the ancient Chinese instrument, hanging on a structure similar to a clothes' horse. An emperor's qins might be made of jade, with a beautiful delicate sound, and would have been placed in his tomb to provide entertainment in the afterlife.
In the photo below, the ritual bronze bells can be seen on the left.