"Calm Down" is a song by American rapper Busta Rhymes, released as the third single from his upcoming tenth studio album, E.L.E.2 (Extinction Level Event 2). The song features American rapper Eminem and was produced by Scoop DeVille. It was released for digital download on July 1, 2014 by The Conglomerate Entertainment and Empire Distribution.

In September 2013, Busta Rhymes confirmed the collaboration in an interview with XXL, saying: "I’ve got a six-minute record with Eminem that sounds like we are respectfully trying to battle each other in a way that you probably never heard us battle in our entire careers on a record. So it’s lot of real incredibly golden moments for us on this project." In January 2014, the song's producer Scoop DeVille spoke about the song in an interview with Vlad TV, saying that "That's the next record that's going to, I'd say destroy the streets of New York and Hip Hop in a lot of ways" and "bring back Busta in a major way." He revealed that the song, 6 minutes in length, had been worked on for a long time and was planned to have an accompanying music video as well.

In July 2014, during an interview with Power 106, Busta explained that as he and Eminem kept going "back and forth" in a competitive, battling manner, the song went from three minutes and eight seconds to 6 minutes. Busta continued: "We [were] like, 'Yo, listen, it's one thing to say F the rules, but it's another thing to say we're O.D.ing," and called the song a "special," "beautiful piece of art."

In a July 2014, interview with Complex, Busta explained how the song came together. Scoop provided Busta with the instrumental, which Busta "loved". He immediately recorded two 16-bar verses and titled the song "Calm Down". After "marinating" on the song for some time, Busta felt that it "would be an incredible record for Eminem to get on" and called his own manager Chris Lighty, and requested him to arrange a meeting with Eminem's manager, Paul Rosenberg, to whom they gave the song, but were not informed whether Eminem would record for the song. After six weeks, Busta's associate Shaheem Reid reached out to then-Shady Records A&R Riggs Morales, who came by the studio to hear the song, and two weeks later, Rosenberg finally confirmed that Eminem "had got the beat and that he’s fucking with it."

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