The somber music is the cue to the crowd to quiet down and listen—it is very effective in practice.
Then Trump winds up to a big finish, with “We will make America great again”—which he says slower in tempo because the crowd says it along with him.
“The somber music is the cue to the crowd to quiet down and listen—it is very effective in practice.”
That makes sense. And so they know the end is coming,