The concert rider is the part of the agreement between the performer and and the promoter over what needs to be provided to the artist before, during and after the gig. Items include something as mundane as load-in/load-out times and the kind of electrical contractor needed to hook the lighting system to the grid.
But the best part is often what the performer requires backstage. Buzzfeed has this one from Beyonce’s tour. Click on the image to get started.