The secret didn't stay hidden for long. In July 2016, following the couple's breakup, Swift’s representatives confirmed she was indeed the primary songwriter.
: Swift originally wrote the song on a piano and sent a voice memo demo to Harris.
: The relationship reportedly soured after Harris did an interview with Ryan Seacrest where he dismissed the idea of ever collaborating with Swift. taylor swift this is what you came form4a hot
: Interest in the track remains "hot" among fans (often searched via high-quality M4A formats) due to a leaked 2023 demo featuring Swift’s solo vocals, which offers a more stripped-back, "storyteller" version compared to the EDM final product.
: It’s generally seen as a club anthem about magnetic attraction. The secret didn't stay hidden for long
Calvin Harris confirms Taylor Swift wrote This Is What ... - BBC
: After the reveal, Harris posted a series of tweets defending his production work but also accusing Swift’s team of trying to make him look bad, even referencing her rumored feud with Katy Perry. "This Is What You Came For" in the Eras Era : The relationship reportedly soured after Harris did
When the song was first released, the songwriting credits listed Calvin Harris alongside a mysterious "Nils Sjöberg". Swift later revealed she chose this Swedish pseudonym—a combination of two of the most popular male names in Sweden—to prevent her high-profile relationship with Harris from overshadowing the music. She wanted the work to speak for itself, drawing inspiration from how Prince secretly wrote "Manic Monday". The Reveal and the Fallout
: Fans have long noted that if you listen closely to the Rihanna version, you can still hear Swift’s distinct high-pitched "ooh-ooh" backing vocals in the chorus. Lyrical Meaning and Fan Theories
The 2016 hit "This Is What You Came For," famously performed by Rihanna and produced by Calvin Harris, is a landmark track in pop history—not just for its chart success, but for the dramatic revelation that it was secretly co-written by . The Mystery of Nils Sjöberg