Big Machine Records and Republic Records released "Bad Blood" on 17 May 2015 and bring Taylor Swift and Kendrick Lamar to the top of the chart U.S. Billboard 100. This remix version gained success and hit #4 on U.K. Singles Chart. This pop with R&B mixed was written by Taylor Swift with Max Martin, Shellback and Kendrick Lamar. The original version of "Bad Blood" is available on Taylor Swift studio album "1989" which is featuring Taylor Swift alone.
Taylor Swift wrote "Bad Blood" about an undisclosed female musical artist. She says the artist attempted to sabotage one of her concert tour by hiring people who worked for her. Publications such as Billboard, Rolling Stone, Time and The Washington Post have speculated that Katy Perry is the subject of the song.