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.

Here’s a complete Taylor Swift and Kendrick Lamar friendship timeline.

Kendrick Lamar and Taylor Swift may seem like polar opposites to an outsider, but the truth is that they have a long record of friendship and collaboration.