Shawn Mendes and Camila Cabello share how the idea for "I Know What You Did Last Summer" came to them at a Taylor Swift concert, and how they improvised parts of the song in the studio.
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How I Wrote That Song: Shawn Mendes & Camila Cabello "I Know What You Did Last Summer" http://www.youtube.com/fallontonight
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The Tonight Show Starring Jimmy Fallon is an American late-night talk show hosted by Jimmy...