In May 2015, Swift enlisted Kendrick Lamar to appear on the remix of “Bad Blood,” the 1989 clapback track that was reportedly aimed at Katy Perry. The collaboration wasn’t a surprise to those who had been paying attention. For months, the two had been very publicly sharing their admiration for one another.

Drake and Kendrick worked together on two songs that dropped in October 2012, “Poetic Justice,” from Lamar’s second album, “Good Kid, MAAD City,” and A$AP Rocky’s “F–kin’ Problems,” later included on Rocky’s debut album, “Long. Live. ASAP,” the following year. The artists haven’t collaborated on a song since.