Producer: Dr. Luke - Artist: Katy Perry - Additional Producer: benny blanco - Engineer: John Hanes - Asst. Recording Engineer: Tim Roberts - Mixer: Serban Ghenea - Drums: benny blanco - Drums: Steven Wolf - Vocals: Katy Perry

Artist: Katy Perry

Artist: Katy Perry - Programmer: Dr. Luke - Guitar: Dr. Luke - Bass: Dr. Luke - Producer: Dr. Luke - Drums: Dr. Luke - Drums: Benny Blanco - Music Production: Benny Blanco - Programmer: Benny Blanco - Engineer: Emily Wright - Engineer: Sam Holland - Engineer: Nick Banns - Engineer: Tatiana Gottwald - Engineer: Tina Kennedy - Mixer: Serban Ghenea - Assistant Mixer: Tim Roberts - Drums: Steven Wolf - Production Coordinator: Gary Silver - Mastering Engineer: Chris Bellman - Mix Engineer: John Hanes - Programming: Philip Larsen - Remixer: Philip Larsen - Music Production: Philip Larsen - Music Production: Chris Smith - Remixer: Chris Smith - Programming: Chris Smith - Mastering Engineer: Brian "Big Bass" Gardner