Shinedown and Three Days Grace may be co-headlining their current tour, but the third act on the bill isn't exactly your average opener. Veteran hard rock outfit P.O.D. has been playing alongside the two bands throughout both legs of their touring, making for a solid trifecta of rock acts. P.O.D.'s sets are making it worthwhile to get there early, and the band has enjoyed a set crossover of late with Shinedown's Zach Myers joining their performances to play their cover of U2's 'Bullet the Blue Sky.'