It's over 100 years old and one of the most popular songs ranking only behind "Happy Birthday" and "The Star Spangled Banner" in how many times it is sung. It was written by a guy who had never even seen a baseball game (at least up to that point). It wasn't sung in ballparks until about thirty years after it was written yet it was a huge hit at the time of its initial release. It is of course, Take Me Out to the Ballgame. The Baseball Hall of Fame has the entire fascinating history of the song.
On my very first trip to Wrigley Field, I got to join in with the crowd and the king of the anthem, Harry Caray in singing the song during the 7th inning stretch. Caray more than anyone else helped popularize the song.