What is the "fifth quarter" tradition?
The band goes onto the field and plays for about 15 minutes after the game before going outside the stadium and playing a bit more. I can't think of all of them right now, but they're the same one's each time and most of them have some kind of call/response or dance by the crowd (especially the students). It includes Varsity (our alma mater) at the beginning and end, "Space Badgers" (a take on the theme from 2001: a space odyssesy), the chicken dance, time warp (from rocky horror picture show), Tequila, the horse, and swing town.
I've attached the video from the last one from 2018 which was the final game for our longtime music director. You should in no way feel any obligation to watch any of it, but they have it on youtube so I might as well attach it.
edit: and of course the fight song
2nd edit: and our opponent's fight song. Often the opposing cheerleaders and band will participate