2015 single by Taylor Swift featuring Kendrick Lamar
"Bad Blood" is a song by the American singer-songwriter Taylor Swift from her fifth studio album, 1989 (2014). She wrote the song with the producers Max Martin and Shellback, and it is a pop song with stomping drums and keyboards. The lyrics are about betrayal by a close friend; many media publications interpreted that the American singer Katy Perry was the subject. Wikipedia