I ran the Goblin Pyros encounter this evening, where the party fought three goblin warriors and the warchanter. I had downloaded the goblin song audio, and decided to play it (loudly) on repeat until the warchanter died. This drove my players nuts, because they were already sick of it by the second time it looped. They really wanted to kill the warchanter to make it stop. As soon as he fell, I turned off the goblin song, which they heartily celebrated.
This was exactly the effect I was hoping for! I recommend doing this if you're running this AP. :)
