"Crazy In Love" is a popular song sung by American female singer Beyoncé and rapper Jay-Z, composed by Beyoncé and others, as the first single of Beyoncé's first studio album "Dangerously in Love", Released on May 18, 2003.

The song topped many music charts including the Billboard Top 100 Singles Chart in the United States. On August 28, 2003, the music video of the song won the MTV Music Video Award for Best Female Video, Best R&B Video, and Best Cooperation Award. On February 8, 2004, the song won the Grammy Awards for Best R&B Song and Best Rap Collaboration.

"Crazy In Love" was originally composed only by Rich Harrison and the group The Chi-Latest. After Rich Harrison anticipated the rhythm of the song, he selected the song "Are You My Woman?" clips are added to the song. When he showed his pre-tuned rhythm to his friends but did not get approval, he waited for a suitable singer who appreciates the song to record the song. Soon after, he was appreciated by Beyonce. Rich Harrison demonstrated a sample of the song for Beyonce in the studio. At first, Beyonce thought the horn of the song was too harsh.

After that, Rich Harrison wrote part of the lyrics for the song alone for two hours. Beyoncé also wrote the lyrics of the song while humming "I'm looking so crazy right now". , The naming inspiration of the song came from her humming, and Beyoncé was inspired by her shadow in the mirror when creating it. The lyrics of the rap part of the song were improvised by Jay Z at three in the morning, and it took ten minutes to complete.