It seems like a lot of people do their own unique things before workouts and sets.
O ne guy at my gym always does a prayer and points up to the clouds before heavy sets--especially squats. I have a roommate who always to listens to "Headstrong" by Trapt before almost every workout.
Before workouts, I occasionally down some caffeine and take a short nap. Then, I put on some motivational Youtube/Pumping Iron videos while I get ready to leave. Hard rock/metal/rap in the car.
Before sets, I like to close my eyes for a few seconds, block everyone else out, and visualize me succeeding. I usually don't prefer music while working out because I prefer blocking everything out in my mind.
What do you do before your workouts/sets?