Witness

Producer: Max Martin - Artist: Various Artists - Producer: Ali Payami - Engineer: Sam Holland - Asst. Recording Engineer: Cory Bice - Asst. Recording Engineer: Jeremy Lertola - Editor: Peter Karlsson - Mixer: Serban Ghenea - Mix Engineer: John Hanes - Vocals: Various Artists - Background Vocalist: Max Martin - Programming: Max Martin - Percussion: Max Martin - Drums: Ali Payami - Bass Guitar: Ali Payami - Piano: Ali Payami - Acoustic Guitar: Ali Payami - Programming: Ali Payami - Synthesizer: Ali Payami - Percussion: Ali Payami - A & R: Lauren Glucksman - Composer/Author: Various Artists

Artist: Katy Perry - Producer: Max Martin - Producer: Ali Payami - Engineer: Sam Holland - Asst. Recording Engineer: Cory Bice - Asst. Recording Engineer: Jeremy Lertola - Editor: Peter Karlsson - Mixer: Serban Ghenea - Mix Engineer: John Hanes - Vocals: Various Artists - Background Vocalist: Various Artists - Background Vocalist: Astrid S - Programming: Max Martin - Programming: Ali Payami - Percussion: Max Martin - Percussion: Ali Payami - Bass Guitar: Ali Payami - Synthesizer: Ali Payami - Piano: Ali Payami - Other: Max Martin - A & R: Lauren Glucksman - Composer/Author: Various Artists

Artist: Katy Perry - Producer: Max Martin - Producer: Shellback - Producer: Ali Payami - Engineer: Sam Holland - Asst. Recording Engineer: Jeremy Lertola - Asst. Recording Engineer: Cory Bice - Editor: Peter Karlsson - Mixer: Serban Ghenea - Mix Engineer: John Hanes - Vocals: Various Artists - Background Vocalist: Various Artists - Background Vocalist: Shellback - Programming: Max Martin - Keyboards: Max Martin - Bass Guitar: Max Martin - Drums: Max Martin - Percussion: Max Martin - Synthesizer: Max Martin - Programming: Ali Payami - Keyboards: Ali Payami - Bass Guitar: Ali Payami - Drums: Ali Payami - Percussion: Ali Payami - Synthesizer: Ali Payami - Programming: Shellback - Keyboards: Shellback - Bass Guitar: Shellback - Drums: Shellback - Percussion: Shellback - Synthesizer: Shellback - A & R: Lauren Glucksman - Composer/Author: Various Artists

Producer: Duke Dumont - Artist: Various Artists - Featuring: Nicki Minaj - Additional Producer: PJ “Promnite” Sledge - Engineer: Noah "Mailbox" Passovoy - Engineer: Rachael Findlen - Asst. Recording Engineer: Zeke Mishanec - Additional Producer: Noah "Mailbox" Passovoy - Mixer: Serban Ghenea - Mix Engineer: John Hanes - Vocals: Various Artists - Synthesizer: Duke Dumont - Drums: Duke Dumont - Programming: Duke Dumont - Keyboards: PJ “Promnite” Sledge - Engineer: Aubry "Big Juice" Delaine - Recording Engineer: Aubry "Big Juice" Delaine - Asst. Recording Engineer: Iain Findlay - A & R: Lauren Glucksman - Composer/Author: Various Artists

Producer: Hayden James - Artist: Katy Perry - Engineer: Noah "Mailbox" Passovoy - Engineer: Rachael Findlen - Additional Producer: Noah "Mailbox" Passovoy - Mixer: Serban Ghenea - Mix Engineer: John Hanes - Vocals: Various Artists - Guitar: Hayden James - Bass Guitar: Hayden James - Background Vocalist: Hayden James - Synthesizer: Hayden James - Synthesizer: Thomas Stell - Other: Lauren Glucksman - Composer/Author: Various Artists

Producer: Jack Garratt - Artist: Katy Perry - Engineer: Noah "Mailbox" Passovoy - Engineer: Rachael Findlen - Additional Producer: Noah "Mailbox" Passovoy - Mixer: Serban Ghenea - Mix Engineer: John Hanes - Vocals: Various Artists - Other: Jack Garratt - Other: Lauren Glucksman - Composer/Author: Various Artists

Producer: Corin Roddick - Artist: Katy Perry - Engineer: Noah "Mailbox" Passovoy - Engineer: Rachael Findlen - Editor: Noah "Mailbox" Passovoy - Additional Producer: Corin Roddick - Additional Producer: Rachael Findlen - Mixer: Serban Ghenea - Mix Engineer: John Hanes - Vocals: Various Artists - A & R: Lauren Glucksman - Composer/Author: Various Artists

Producer: Ali Payami - Artist: Katy Perry - Producer: Corin Roddick - Engineer: Rachael Findlen - Additional Producer: Max Martin - Additional Producer: Rachael Findlen - Additional Producer: Corin Roddick - Additional Producer: Ali Payami - Additional Producer: Peter Karlsson - Mixer: Serban Ghenea - Mix Engineer: John Hanes - Vocals: Various Artists - Background Vocalist: Ali Payami - Programming: Ali Payami - Drums: Ali Payami - Bass Guitar: Ali Payami - Keyboards: Ali Payami - Piano: Ali Payami - Electric Guitar: Ali Payami - Percussion: Ali Payami - Acoustic Guitar: Max Martin - A & R: Lauren Glucksman - Composer/Author: Various Artists

Producer: Max Martin - Artist: Various Artists - Producer: Ali Payami - Featuring: Skip Marley - Engineer: Sam Holland - Asst. Recording Engineer: Cory Bice - Asst. Recording Engineer: Jeremy Lertola - Editor: Peter Karlsson - Mixer: Serban Ghenea - Mix Engineer: John Hanes - Vocals: Katy Perry - Background Vocalist: Katy Perry - Background Vocalist: Sia - Background Vocalist: Max Martin - Background Vocalist: Skip Marley - Programming: Max Martin - Programming: Ali Payami - Clapping: Ali Payami - Drums: Ali Payami - Bass Guitar: Ali Payami - Synthesizer: Ali Payami - Piano: Ali Payami - Percussion: Ali Payami - Percussion: Peter Karlsson - Keyboards: Max Martin - Additional Keyboards: Max Martin - Guitar: James Alan Ghaleb - A & R: Lauren Glucksman - Composer/Author: Katy Perry

Artist: Katy Perry - Producer: Mike Will Made-It - Producer: Scooly - Additional Producer: Noah "Mailbox" Passovoy - Engineer: Noah "Mailbox" Passovoy - Engineer: Stephen “The Sauce” Hybicki - Engineer: Rachael Findlen - Producer: Noah "Mailbox" Passovoy - Mixer: Serban Ghenea - Mix Engineer: John Hanes - Vocals: Various Artists - Guitar: Casey Hooper - Bass Guitar: Joshua Moreau - Keyboards: Noah "Mailbox" Passovoy - Percussion: Noah "Mailbox" Passovoy - Programming: Noah "Mailbox" Passovoy - A & R: Lauren Glucksman - Composer/Author: Various Artists

Producer: Max Martin - Artist: Various Artists - Featuring: Migos - Producer: Shellback - Producer: Oscar Holter - Engineer: Sam Holland - Asst. Recording Engineer: Jeremy Lertola - Asst. Recording Engineer: Cory Bice - Editor: Peter Karlsson - Recording Engineer: Daryl "DJ Durel" McPherson - Mixer: Serban Ghenea - Mix Engineer: John Hanes - Keyboards: Oscar Holter - Programmer: Oscar Holter - Keyboards: Shellback - Programmer: Shellback - Background Vocalist: Shellback - Vocals: Various Artists - A & R: Lauren Glucksman - Composer/Author: Various Artists

Artist: Katy Perry - Producer: Oscar Holter - Producer: Corin Roddick - Engineer: Noah "Mailbox" Passovoy - Engineer: Rachael Findlen - Editor: Noah "Mailbox" Passovoy - Additional Producer: Corin Roddick - Additional Producer: Rachael Findlen - Mixer: Serban Ghenea - Mix Engineer: John Hanes - Vocals: Various Artists - Programming: Oscar Holter - Keyboards: Oscar Holter - Editor: Oscar Holter - A & R: Lauren Glucksman - Composer/Author: Various Artists

Producer: Elof Loelv - Artist: Katy Perry - Engineer: Elof Loelv - Engineer: Rachael Findlen - Additional Producer: Max Martin - Editor: Peter Karlsson - Mixer: Serban Ghenea - Mix Engineer: John Hanes - Vocals: Various Artists - Programming: Elof Loelv - Drums: Elof Loelv - Bass Guitar: Elof Loelv - Piano: Elof Loelv - Synthesizer: Elof Loelv - A & R: Lauren Glucksman - Composer/Author: Various Artists

Producer: Jeff Bhasker - Artist: Katy Perry - Additional Producer: Illangelo - Engineer: Ryan Nasci - Engineer: Noah "Mailbox" Passovoy - Engineer: Rachael Findlen - Additional Producer: Noah "Mailbox" Passovoy - Mixer: Serban Ghenea - Mix Engineer: John Hanes - Vocals: Various Artists - Keyboards: Jeff Bhasker - Drum Programming: Jeff Bhasker - Drum Programming: Illangelo - Bass Guitar: Pino Palladino - Contracting With: Edie Lehmann Boddicker - Chorus Conductor: Edie Lehmann Boddicker - Choir: Nelson Beato - Choir: Edie Lehmann Boddicker - Choir: Alexandra Brown - Choir: Denise Carite - Choir: Charlean Carmon - Choir: Carmen Carter - Choir: Monique Donnelly - Choir: Carmel Echols - Choir: Luke Edgemon - Choir: Anthony Evans - Choir: Jim Gilstrap - Choir: Clydene Jackson - Choir: Briana Lee - Choir: David Loucks - Choir: Jamie McCrary - Choir: Louis Price - Choir: Aretha Scruggs - Choir: Toni Scruggs - Choir: Carmen Twillie - Choir: Oren Waters - Choir: Will Wheaton - Choir: Eyvonne Williams - Choir: Brandon Winbush - Choir: Jason Woods - A & R: Lauren Glucksman - Composer/Author: Various Artists

Producer: Dustin O'Halloran - Artist: Katy Perry - Mixer: Serban Ghenea - Mix Engineer: John Hanes - Vocals: Katy Perry - Engineer: Rachael Findlen - Engineer: Francesco Donadello - Other: Dustin O'Halloran - Co-Arranger: Dustin O'Halloran - Drum Programming: Rob Simonsen - A & R: Lauren Glucksman - Composer/Author: Various Artists