Set lists are tough because you come up with this structure of how the songs are going to go from one to the next but at the same time you have to be spontaneous and take requests and change the set list at the drop of a hat.
I think one of the coolest things about the job is the level of trust we have for each other. The actors fully trust that the writers will write amazing episodes and the writers trust that the actors will follow their instincts with the characters.