Credits
Imogen Heap: Drums, Programming, Producer, Percussion, Engineer, Keyboards, Backing Vocals, Vibes
Taylor Swift: Guitar, Producer, Executive Producer, Shouts, Vocals, Handclaps
Ryan Tedder: Guitar, Programming, Producer, Drum Programming, Engineer, Juno, Synthesizer, Piano, Backing Vocals
Greg Kurstin: Additional Production, Keyboards
Max Martin: Programming, Producer, Executive Producer, Keyboards, Piano, Shouts, Vocal Producer, Backing Vocals, Handclaps
Noel Zancanella: Bass, Programming, Producer, Drum Programming, Synthesizer
Tom Coyne: Mastering
Josh Newman: Art Direction
Michael Ilbert: Engineer
Bethany Newman: Art Direction
Nathan Chapman: Guitar, Bass, Drums, Producer, Engineer, Keyboards
Shellback: Guitar, Bass, Drums, Programming, Producer, Percussion, Foot Stomping, Keyboards, Knee Slaps, Noise, Shouts, Backing Vocals, Handclaps
Sam Holland: Engineer
Smith Carlson: Engineer
Laura Sisk: Engineer
Jack Antonoff: Guitar, Bass, Drums, Producer, Engineer, Keyboards, Backing Vocals
Peter Carlsson: Pro Tools
Mattman & Robin: Guitar, Bass, Drums, Programming, Producer, Percussion, Keyboards
Ali Payami: Programming, Producer, Keyboards
Jonas Lindeborg: Trumpet
Magnus Wiklund: Trombone
Jonas Thander: Saxophone