"Let's Get Loud" is a song recorded by American singer Jennifer Lopez for her debut studio album On the 6 (1999). Originally written by the song's co-writer Gloria Estefan for herself, she felt as if the song was too similar to her previous material and passed it onto Lopez. Estefan, who co-wrote the song alongside Kike Santander, stated that she would have "more fun with it" and would put "a new spin" on it. "Let's Get Loud" is often regarded as Lopez's signature song. Estefan eventually released her own version of the song in 2011 as a bonus track on the deluxe Target edition of her album Miss Little Havana.

Since its release, "Let's Get Loud" charted on several charts around the world, reaching the top ten on five European countries. Despite not being released in the United States, it also charted on the US Billboard Hot Dance Club Songs. "Let's Get Loud" received positive critical response and at the 43rd Grammy Awards in 2001, Lopez earned her second consecutive nomination for the Grammy Award for Best Dance Recording with the song. An accompanying music video was directed by Jeffrey Doe and filmed live at the 1999 FIFA Women's World Cup.

After a series of co-starring film roles, Lopez received her big break in 1996, when she was cast to play the title role in Selena, a biopic of the late American singer-songwriter Selena. In the film, Selena's real voice is used for the musical sequences, but Lopez would nonetheless sing the lyrics during the scenes instead of lip syncing. When asked by an interview if Selena inspired her to launch a music career, Lopez stated: "I really, really became inspired, because I started my career in musical theater on stage. So doing the movie just reminded me of how much I missed singing, dancing, and the like..." After filming Selena, Lopez was "really feeling [her] Latin roots" and cut a demo in Spanish. Lopez's manager then sent the song, entitled "Vivir Sin Ti", to Sony Music Entertainment's Work Records, who showed an interest in signing Lopez. Tommy Mottola, the head of the label suggested to her that she sing in English instead. She complied and began recording her debut studio album On the 6. During production of the On the 6, Lopez was aware of the fact that she received her recording contract on the premise of her looks and having an already established name in the entertainment industry, and wanted to prove that she had musical talent. Prior to the debut of her music, critics wondered why she would take the risk of launching a music career. It was noted that: "If the album was a flop, not only would it embarrass Lopez, but it might even damage her career."

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