[Ans] what song did taylor swift write about katy perry?

Step 1 : Introduction to the question "what song did taylor swift write about katy perry?"

Soon after Katy Perry's "Swish Swish" was released, critics wrote how the track appeared to be a diss track in response to Taylor Swift's 2014 song, "Bad Blood". On May 22, 2017 while appearing on Carpool Karaoke on The Late Late Show with James Corden, after singing to "Swish Swish", Corden asked Perry about a 2013 feud between her and Taylor Swift. "There's a situation," Perry said. "Honestly, it's really like she started it, and it's time for her to finish it."

Step 2 : Answer to the question "what song did taylor swift write about katy perry?"

Publications such as Billboard, Rolling Stone, Time, and The Washington Post have speculated that Katy Perry is the subject of the song.

Step 3 : Other interesting facts related to the question "what song did taylor swift write about katy perry?"

For their tenth anniversary, How It Should Have Ended released a cover parody video based on "Bad Blood", titled "Bat Blood". Performed by Batman, voiced by show creator Daniel Baxter. "Bad Blood" received eight nominations at the 2015 MTV Video Music Awards Rolling Stone described it as a "futuristic neo-noir" video