Answer:
I don't remember much from the book because I haven't read it in a long time but basically after I think a long march to a new camp, everyone collapses onto the floor, crushing each other. Eli, also crushed against the bodies hears Juliek. Juliek worries only of his violin which is also crushed under the pile of dead or alive bodies. He somehow managed to grab his violin and plays a fragment of a Beethoven concerto before dying. Possibly died suffocating under the bodies
