These half time shows are such crap. I think it is intentional to get people to crash the concession and souvenir stands. Also the folks at home can run to the corner store for Doritos, Bryan Franks, Pringles, Bud and whatnot.
This is pre-game, not half time, and it's outside the stadium. It's just a made-for-TV event, and a free concert for the locals who care.