Bad Blood (Taylor Swift song)

"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 Swedish producers Max Martin and Shellback. It is a pop song using keyboards and hip-hop-inspired drum beats, and the lyrics are about betrayal by a close friend. A remix featuring the American rapper Kendrick Lamar, with additional lyrics by Lamar and production by the Swedish musician Ilya, was released to radio as 1989's fourth single on May 17, 2015, by Big Machine and Republic Records.