Before spring 2015, U2 hadn't played in the Valley in about six years, and the concert made up for the absence in every way. From a near flawless performance to jaw-dropping stage design, U2's concert set the bar extremely high for arena shows, and it's doubtful anyone will surpass it anytime soon. The genius of U2's stage show was how it considered the viewpoint of everyone in the audience, not just the front rows. The stage spanned the normal width of the bottom of the arena but also included a catwalk which jutted out from the main stage and stretched for most of the arena's floor, ending in a circular platform. The band, equipped with wireless instruments and, in the case of percussion, a marching harness, strolled down the catwalk throughout the show, giving everyone in the crowd an eyeful.
But the crown was a metal cage that stretched the length of the catwalk and descended over it throughout the show, allowing Bono and others to walk inside as videos projected onto the sides. Sitting on the sides of the arena was like watching a big-screen TV, in which a real-life Bono interacted within an animated music video.