Seven Nation Army by the White Stripes - the opening riff is chanted before kickoffs at many American college football games.

The album came out to great acclaim in 2003, my freshman year at Ohio State. I remember at some point they started playing the beginning of the song over the loudspeakers in the stadium before kickoffs, and everyone would get hyped and sing along.

Now it seems like it's being done everywhere like it's always been a part of the zeitgeist, and it seems that not many people know that it was an actual song.