by Kayla YandoliBuzzFeedBuzzFeed Staff 1. Taylor Swift co-wrote "This Is What You Came For" with Calvin Harris, which he released as a single with Rihanna in 2016. The original songwriting credits were given to Harris and an unknown writer named Nils Sjöberg. Rolling Stone later confirmed that it was Swift's songwriting alias, as she wanted to keep her credit secret. Westbury Road / Sony / Anthony Harvey / Getty Images Harris eventually became frustrated that the spotlight was on Swift's songwriting credit rather than his own, and he vocalized this after they broke up in 2016.