What happens to Juliek and his violin?

Juliek is a violin player from Warsaw, who played in the Buna band. It was at the Buna camp that Eliezer first met him. Juliek, along with Eliezer and countless other prisoners, is dropped off at Gleiwitz en route to the concentration camp at Buchenwald. When they arrive at Gleiwitz, the prisoners are herded into overcrowded barracks. In the ensuing crush, Eliezer feels like he's being suffocated to death. Thankfully, Eliezer manages to extricate himself from the mass of bodies and gets some air. As indeed does Juliek.
That night in the barracks Juliek plays Beethoven on his violin. The sweet melody is a stark contrast to the mass of dead and dying men around him. Juliek's playing of the violin is a defiant assertion of what little humanity he has left after the Nazis have stripped him of his dignity. The violin is the only thing he has left in life. He knows that he too will soon die in the crush of bodies, but before he passes away he's determined to play the music he loves because he knows he'll never get the chance again. That night, Juliek and his violin are crushed, symbolizing the Nazis' ruthless crushing of the human spirit in the concentration camps.