B1A4 Group B1A4, a name we're hearing more and more of, held their first Japanese Solo Concert yesterday evening at Japan Yokohama Arena. They have three more stops on the Japanese leg of their tour, allowing them to reach over 30,000 fans. They sang many fan favorite songs, including a Japanese-version of their hit song, "O.K." The group said, "Fans are our energy. If we are together, we can sing all night long." How great would it be if they actually sang the whole night through? We wouldn't mind!