Everyone, I'm sure, remembers where they were on September 11, 2001.
I was at work, for example, when terrorists hijacked planes in New York & Washington. Major League Baseball took an unscheduled vacation as games were cancelled or postponed. The then-World Wrestling Federation, now WWE, postponed its taping of Smackdown, which at the time aired on Thursdays, and instead went live two nights later in Houston.
Just days after the attacks, Alan Jackson wrote "Where Were You (When The World Stopped Turning)", which was released as a single two months later. The track was included on Jackson's 2002 CD, "Drive".
Today, 19 years after the attacks, the song is being played on radio stations across the country to mark the anniversary, to honor the victims of those attacks. The following clip comes from the 2015 Academy of Country Music Awards ceremony on CBS.