in football ("soccer") it's different, we don't really care about shows, performances or anything like that at the level they care in America. We wan't to see the game. If it was a half-time show it'd be worse. On the other hand, every year it's more common to have a kick-off show, but it's really not that important for the game, nobody's going to see/watch the game just for the show, it's like an add-on.