What does juliek play at gleiwitz who is his audience?

You're likely referring to the character Juliek from Elie Wiesel's novel "Night." While Juliek does play the violin in the novel, it's not in Glewitz. Here's what we know:

* Juliek plays the violin at Buna, a forced labor camp. He plays during a selection process, a moment of fear and uncertainty where people are being chosen for either work or death.

* His audience is primarily the prisoners themselves. He plays Beethoven, a powerful and uplifting piece, in an attempt to give them strength and comfort during a terrifying time.

While it's not explicitly stated, it's likely that some guards and SS officers also hear Juliek play. His performance represents a brief moment of beauty and humanity amidst the horrors of the camp.

Let me know if you have any other questions about "Night" or Elie Wiesel!