American singer Jennifer Lopez was supposed to perform the official song at the opening ceremony of the World Cup in Brazil. However, her agent told FIFA (the organisers of the tournament) that she has pulled out. The agent said: "Regretfully, Jennifer Lopez will not be attending this year's World Cup opening ceremonies." Neither the star nor her agent gave a specific reason why, but said it was due to "production issues". Lopez was going to join the rapper Pitbull and Brazilian star Claudia Leitte onstage ahead of the opening game between hosts Brazil and Croatia. FIFA announced on its website that the song, "We Are One (Ole Ola)," would now be sung just by Pitbull and Ms Leitte.