It was a bill that already contained two towering giants in the hip-hop game, and if that weren’t enough, their swagtastic performance together at the Verizon Center proved why Jay-Z and Kanye are the hottest pair in the genre. Jay-Z entered one end of the floor in a rising tower in a black T-shirt and black pants, Kanye West in a matching shirt and a ridiculous black knee-length tunic -- as if only to draw even more attention to himself at tower No. 2. But despite their differences in appearances, style, and bravado, the mega-hit-making duo were dynamic in concert together at the sold-out show. Once joined together at center stage with a giant American flag as a backdrop, the Jay and Ye got into the set list of their first full-album together, “Watch the Throne,” with a powerful rendition of “Otis.” Later on in the evening, they went on to sing hit songs from each other’s storied careers in an unforgettable two-hour set.