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.

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.

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