The End (Spoiler)
So this is one of those endings where I'm thinking, "there's more, right?"
No, so then I had to go back and figure it out. Help me with this. So he went mad, right? The culmnination of events finally took a toll on him (his mother, his wife who turned in his friend, guilt from not being able to help friend, and finally seeing those people suffer). Also, he seemed to be in denial when his friend was trying to explain to him what was to come. He overlooked the obvious fear that his friend had. This time the people kept playing the instruments.
Was there some meaning behind the disarray of the new arrivals, how they were running about, or was that just illustrating healthy, unknowing new arrivals?