The conventional wisdom is to start the night with an upbeat song, not a slow ballad, but not to waste a strong banger this early. Let'em know that you are here! That is easy to say, but quite a balancing act. Maybe I would understand better if we created a list of songs that are upbeat and strong, but not wasted in the warm-up. I haven't tried it with audiences, but my guess is 1. I've just seen a face - Beatles