Producer: Dr Luke - Artist: Katy Perry - Producer: Benny Blanco - Composer/Author: Katy Perry

Producer: Dr. Luke - Artist: Katy Perry - Producer: Max Martin - Composer/Author: Katy Perry

Interprète Vocal: Katy Perry - Producer: Dr. Luke - Featuring: Snoop Dogg - Producer: benny blanco - Producer: M. Martin - Composer/Author: Katy Perry

Artist: Katy Perry - Producer: StarGate - Producer: Sandy Vee - Vocals: Katy Perry - Composer/Author: Katy Perry

Vocals: Katy Perry - Producer: StarGate - Musician: Mikkel S. Eriksen - Recording Engineer: Mikkel S. Eriksen - Musician: Tor Erik Hermansen - Recording Engineer: Miles Walker - Mix Engineer: Serban Ghenea - Mix Engineer: John Hanes - Assistant Mixer: Tim Roberts - Mastering Engineer: Brian "Big Bass" Gardner - Composer/Author: Katy Perry

Vocals: Katy Perry - Drum Programming: C. "tricky" Stewart - Sound Effects: C. "tricky" Stewart - Other: C. "tricky" Stewart - Keyboards: C. "tricky" Stewart - Producer: C. "tricky" Stewart - Recording Engineer: Brian "B-Luv" Thomas - Other: Andrew Wuepper - Recording Engineer: Andrew Wuepper - Recording Engineer: Chris "TEK" O'Ryan - Sound Effects: Chris "TEK" O'Ryan - Other: Chris "TEK" O'Ryan - Drum Programming: Pat Thrall - Engineer: Pat Thrall - Asst. Recording Engineer: Luis Navarro - Asst. Recording Engineer: Steven Dennis - Asst. Recording Engineer: mark Gray - Asst. Recording Engineer: Randy Urbanski - Asst. Recording Engineer: Kory Aaron - Asst. Recording Engineer: Nicolas Essig - Guitar: Charles Malone - Asst. Recording Engineer: Charles Malone - Asst. Recording Engineer: Travis Harrington - Asst. Recording Engineer: Justin Roberts - Mix Engineer: Jaycen-Joshua - Assistant Mixer: Giancarlo Lino - Vocal Producer: Kuk Harrell - Guitar: Julio Miranda - Guitar: Daniel Silvestri - Bass (Vocal): Daniel Silvestri - Drums: Josh Freese - Engineer: Nick Chahwala - Recording Engineer: Nick Chahwala - Engineer: Steve Churchyard - Other: Mike Green - Sound Effects: Mike Green - Mastering Engineer: Brian "Big Bass" Gardner - Composer/Author: Katy Perry

Vocals: Katy Perry - Producer: Dr. Luke - Keyboards: Dr. Luke - Drums: Dr. Luke - Programming: Dr. Luke - Producer: M Martin - Keyboards: M Martin - Drum: M Martin - Programming: M Martin - Recording Engineer: Emily Wright - Recording Engineer: Sam Holland - Asst. Recording Engineer: Tatiana Gottwald - Mix Engineer: Serban Ghenea - Mix Engineer: John Hanes - Additional Mixer: Tim Roberts - Recording Arranger: L. Leon Pendarvis - Conductor: L. Leon Pendarvis - Production Coordinator: Irene Richter - Production Coordinator: Megan Dennis - Production Coordinator: Vanessa Silberman - Mastering Engineer: Brian "Big Bass" Gardner - Composer/Author: Katy Perry

Artist: Katy Perry - Producer: Lukasz "Dr. Luke" Gottwald - Producer: Max Martin - Composer/Author: Katy Perry

Vocals: Katy Perry - Drum Programming: C. "tricky" Stewart - Keyboards: C. "tricky" Stewart - Producer: C. "tricky" Stewart - Recording Engineer: Brian Thomas - Drum Programming: Brian Thomas - Other: Andrew Wuepper - Recording Engineer: Andrew Wuepper - Guitar: Brent Paschke - Guitar: Michael Thompson - Engineer: Pat Thrall - Recording Engineer: Chris "TEK" O'Ryan - Vocal Producer: Kuk Harrell - Asst. Recording Engineer: Luis Navarro - Asst. Recording Engineer: Steven Dennis - Asst. Recording Engineer: mark Gray - Asst. Recording Engineer: Jason Sherwood - Asst. Recording Engineer: Randy Urbanski - Mix Engineer: Jaycen-Joshua - Assistant Mixer: Giancarlo Lino - Mastering Engineer: Brian "Big Bass" Gardner - Composer/Author: Katy Perry

Vocals: Katy Perry - Mixer: Serban Ghenea - Mix Engineer: John Hanes - Assistant Mixer: Tim Roberts - Drums: Greg Wells - Piano: Greg Wells - Producer: Greg Wells - Programmer: Greg Wells - Synthesizer: Greg Wells - Synthesizer: Fabien Waltmann - Programmer: Fabien Waltmann - Recording Engineer: Lewis Tozour - Mastering Engineer: Brian "Big Bass" Gardner - Composer/Author: Katy Perry

Vocals: Katy Perry - Drum Programming: C. "tricky" Stewart - Keyboards: C. "tricky" Stewart - Producer: C. "tricky" Stewart - Recording Engineer: Brian "B-Luv" Thomas - Other: Andrew Wuepper - Recording Engineer: Andrew Wuepper - Recording Engineer: Chris "TEK" O'Ryan - Drum Programming: Pat Thrall - Engineer: Pat Thrall - Asst. Recording Engineer: Luis Navarro - Asst. Recording Engineer: Steven Dennis - Asst. Recording Engineer: Nicolas Essig - Mixer: Serban Ghenea - Asst. Recording Engineer: Randy Urbanski - Mix Engineer: Serban Ghenea - Assistant Mixer: Tim Roberts - Vocal Producer: Kuk Harrell - Guitar: Brent Paschke - Bass (Vocal): Michael Thompson - Guitar: Michael Thompson - Keyboards: Monte Neuble - Drums: Josh Freese - Engineer: John Hanes - Engineer: Steve Churchyard - Mastering Engineer: Brian "Big Bass" Gardner - Mix Engineer: John Hanes - Composer/Author: Katy Perry

Vocals: Katy Perry - Programmer: Greg Wells - Producer: Greg Wells - Piano: Greg Wells - Drums: Greg Wells - Recording Engineer: Lewis Tozour - Mix Engineer: Serban Ghenea - Engineer: John Hanes - Assistant Mixer: Tim Roberts - Mastering Engineer: Brian "Big Bass" Gardner - Mix Engineer: John Hanes - Composer/Author: Katy Perry