Seventh-inning stretch

In baseball in the United States and Canada, the seventh-inning stretch is a tradition that takes place between the halves of the seventh inning of a game -- in the middle of the seventh inning. Fans generally stand up and stretch out their arms and legs and sometimes walk around. It is a popular time to get a late-game snack or an alcoholic beverage as well, as vendors end alcohol sales after the last out of the seventh inning. The stretch also serves as a short break for the players. Most ballparks in professional baseball mark this point of the game by playing the crowd sing-along song ``Take Me Out to the Ball Game''. Since the September 11 attacks, many American ballparks complement or replace the song with the playing of ``God Bless America.'' If a game goes into a fifth extra inning, a similar ``fourteenth-inning stretch'' is celebrated (as well as a possible ``twenty-first inning stretch'' or ``twenty-eighth inning stretch''). In softball games, amateur games scheduled for only seven innings, or in minor-league doubleheaders, a ``fifth-inning stretch'' may be substituted.

Question: do all baseball teams sing the 7th inning stretch
Answer: no