When is the song take you out to the ball game sung at a baseball game?

When is the song take you out to the ball game sung at a baseball game?
Most ball parks sing it during the 7th Inning Stretch.

Well, they don't really play the entire song before or after the ball game. They usually might play little bits of the song in the middle of the game but, theres no specific time where everyone sings the song.