Watching the World Cup? How many times have you heard the crowd changing “Seven Nation Army?” And why are they doing that?

How many times have you heard the crowd changing “Seven Nation Army?” And why are they doing that? Watching the World Cup?
In fact, some argue it has become one of the most recognizable melodies of all time. Now sung by millions around the globe — especially in soccer stadiums, but also in sports arenas from hockey rinks to basketball courts — those seven little notes have taken on a life of their own. So how did Seven Nation Army become a soccer megahit? A few years later, it also began its transformation from indie rock staple to a worldwide sports anthem. Think about just the number of times we’ve heard it during this year’s World Cup. Keep reading. The CBC reports:
Even if you don’t know the White Stripes song Seven Nation Army, you almost certainly know the unmistakable opening notes. Here are seven fascinating facts. And what does frontman Jack White think about the song being co-opted by footie fans? How did it spread to other sports? (No, Jack does NOT get royalties from crowd chants.) How did all this come to be? Jack White stumbled on a magical sequence of seven notes when he came up with the hook in “Seven Nation Army.” Not only did it become a sizeable hit for the White Stripes, but the song has also become the World’s Most Popular Soccer Anthem™. First released in March 2003, the track became the Detroit duo’s biggest song.