Final answer:
Levi's reaction to hearing the reveille music in the infirmary is one of dread and despair, symbolizing the harsh and dehumanizing conditions of life in the concentration camp. This relates to the subtitle of the book, 'If This is a Man,' which emphasizes the dehumanizing experience of the prisoners during the Holocaust.
Step-by-step explanation:
Levi's reaction to hearing the reveille music in the infirmary is described as one of dread and despair. The sound of the music signifies that it is time for the prisoners to wake up and begin their daily labor.
For Levi, this is a painful reminder of the harsh and dehumanizing conditions of life in the concentration camp. This reaction relates to the subtitle of the book, 'If This is a Man,' which highlights the dehumanizing experience of the prisoners during the Holocaust.