TAMPA — Fall Out Boy’s headlining set at MidFlorida Credit Union Ampitheatre on Tuesday kicked off with a bang. Many earsplitting bangs, in fact. After the red velvet curtain peeled open to reveal the four-piece band, the first handful of songs set the tone with a POP!-POP!-POP! of fireworks, plumes of fog and showers of sparks. Ribbons of flame flared across the stage and burst from the end .