"Where Were You (When the World Stopped Turning)" is a song written by the American singer-songwriter Alan Jackson. It was the lead single from his tenth studio album, Drive (2002), released on Arista Nashville. The song's lyrics center on reactions to the September 11 attacks in the United States, written in the form of questions. Jackson desired to write a song capturing the emotions surrounding the attacks, but found it difficult to do so.

He debuted the song publicly at the Country Music Association's annual awards show on November 7, 2001. It was released that month as a single and topped the Hot Country Singles & Tracks chart for five weeks; in addition, it reached number 28 on Billboard's all-genre Hot 100 chart. The song received largely positive reviews from critics, who appreciated its simple, largely apolitical stance. The song won multiple awards at the Academy of Country Music and Country Music Association Awards, including Song of the Year, and also earned Jackson his first Grammy Award for Best Country Song.

The song is based on the September 11 attacks, a series of four coordinated terrorist attacks by the Islamic terrorist group al-Qaeda on the United States on September 11, 2001. Jackson had finished walking outside and returned indoors to discover news of the attacks on television. He immediately wanted to write a song expressing his thoughts and emotions, but he found it hard to do so for many weeks. "I didn't want to write a patriotic song," Jackson said. "And I didn't want it to be vengeful, either. But I didn't want to forget about how I felt and how I knew other people felt that day."

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