American singer Jennifer Lopez was supposed to [performing / 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 [pushed / pulled] out. The agent said: "Regretfully, Jennifer Lopez will not be [attending / attended] this year's World Cup opening ceremonies." Neither the star [or / nor] her agent gave a specific [reasoning / reason] why, but said it was due [of / to] "production issues". Lopez was going to [joint / join] the rapper Pitbull and Brazilian star Claudia Leitte onstage [heading / ahead] of the opening game between [hosts / ghosts] Brazil and Croatia. FIFA announced [in / on] its website that the song, "We Are One (Ole Ola)," would now be sung just by Pitbull and Ms Leitte. The World Cup song has [sung / been] a tradition since the 1966 World Cup in England. In [recent / recently] World Cups, people have been unhappy that the song has not [represented / representative] the country [hosting / hosted] the competition. At the South Africa World Cup in 2010, the Colombian singer Shakira sang the [official / officially] song. In 1998, Puerto Rican star Ricky Martin sang the song for the France World Cup. [Many / Much] Brazilians do not like the 2014 song. They say it has a [week / weak] Brazilian rhythm, is [mainly / manly] performed by non-Brazilian musicians and is sung largely in Spanish and English, with a [few / two] seconds of Portuguese at the end. Brazilian composer and music critic Leonardo Martinelli said the song has been "[stripped / striped] of local colour".