4. The narrator could hear the din of military music in the background. What did the music sound like?

The music sounded like a a marching song.

Explanation:

Elie Wiesel's memoir Night tells of his own experiences eyewitness of the Holocaust and how the discrimination against the Jews was done by the Germans. This book became one of the most incriminating and also a valuable source of the true events of the Holocaust and provides a unique yet personal perspective of the most notorious genocide in the history of the world.

The narrator Elie mentioned that they were taken for another selection which his father thinks is "a decisive one". Giving him his "inheritance" of a spoon and a knife, his father told him to stay on the course. Then, Elie noticed that they were marching too fast, and were counted at the gate. And nearby, he could hear "the din of military music". This sounded like they were soldiers marching on, with a marching song playing in the background.  

idk vro dont ask me lol

op: object of preposition