Neil Diamond's "Sweet Caroline" has been played in the middle of the 8th inning at every Boston Red Sox game since 2002.  Diamond revealed in an interview just a few years ago that Caroline Kennedy was the inspiration for the song. 

He says the image of her on a horse when she was a child stayed with him until he wrote the song.

The New York Yankees paid tribute to the Boston Marathon victims when they played "Sweet Caroline" during a game the day after the bombings.  And most other teams around Major League Baseball followed suit.

On Saturday, Neil Diamond himself showed up at the Red Sox game against Kansas City to sing the song live.