“I Know What You Did Last Summer” is a song by Canadian singer Shawn Mendes and Cuban-American singer Camila Cabello. It was released as the lead single from his 2015 revisited version of his debut studio album, Handwritten (2015) via Island Records on November 18, 2015. “I Know What You Did Last Summer” contains elements from Bill Withers’ 1971 single “Ain’t No Sunshine”, thus songwriting credits was given to Withers. The song is sung in A minor, with a tempo of 112 bpm and a time signature of 4/4.
“I Know What You Did Last Summer” debuted at number ninety-seven on Billboard Hot 100 for the chart dated December 5, 2015 and jumped to number fifty-five on the following week. On the week ending January 9, 2016, the song jumped from number forty-six to number thirty-three. The song has since peaked at number twenty for the chart dated January 30, 2016, becoming Mendes’ second top 20 single.