Producer: Shellback - Artist: Taylor Swift - Producer: Max Martin - Engineer: Michael Ilbert - Engineer: John Haynes - Engineer: Sam Holland - Asst. Recording Engineer: Tim Roberts - Asst. Recording Engineer: Eric Eylands - Asst. Recording Engineer: Greg Fuess - Mastering Engineer: Tom Coyne - Mixer: Serban Ghenea - Acoustic Guitar: Shellback - Keyboards: Max Martin - Vocals: Taylor Swift