- Christina Aguilera – composer, vocal arrangement, vocal producer
- Cher – vocals
- Jess Collins – vocals (background)
- Gene Cipriano – sax (tenor)
- Lauren Chipman – viola
- Daphne Chen – violin
- Andrew Chavez – Pro-Tools
- Chris Chaney – bass
- Alejandro Carballo – trombone
- Frank Capp – castanets
- Jebin Bruni – piano
- Richard Brown – Pro-Tools
- Eddie Brown – piano
- Felix Bloxsom – drums
- Stevie Blacke – cello, viola, violin
- Charlie Bisharat – violin
- Alain Bernardin – composer
- Robert Bacon – guitar
- Spring Aspers – executive in charge of music
- Keith Armstrong – mixing assistant
- Alex Arias – assistant, engineer, Pro-Tools
- Steven Antin – executive soundtrack producer
- Alex Al – acoustic bass
- Thomas Aiezza – assistant engineer
- Andrew Wuepper – engineer, horn engineer, percussion engineer
- Pearl Woods – composer
- Ben Wendell – saxophone
- Roy Weigand – trumpet
- Eric Weaver – assistant
- Melvin K. Watson – composer
- Diane Warren – composer
- Ian Walker – contrabass
- Lia Vollack – executive in charge of music
- Gabe Veltri – engineer
- Rich King vocal producer
- Stephen Vaughan – photography
- Doug Trantow – engineer, Pro-Tools
- Brad Townsend – mixing
- Pat Thrall – engineer
- Brian "B-Luv" Thomas – engineer, horn engineer, percussion engineer
- Chris Tedesco – contracting
- Mark Taylor – vocal producer
- Larry Summerville, Jr. – composer
- C. "Tricky" Stewart – composer, producer, vocal producer
- Eric Spring – engineer
- Sia Furler – composer
- Josh Freese – drums
- Ron Fair – arranger, composer, producer, vocal arrangement, vocal producer
- Peter Erskine – drums
- Ron Dziubla – baritone sax
- George Doering – guitar
- Richard Dodd – cello
- Mark Dobson – engineer
- Samuel Dixon – composer, percussion, producer, programming
- Ester Dean – composer
- Buck Damon – music supervisor
- Jim Cox – horn arrangements, piano
- Pablo Correa – percussion
- Arturo Solar – trumpet
- Joel Shearer – guitar
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- John Patrick Shanley – composer
- Gus Seyffert – acoustic bass, electric bass, baritone guitar
- Matt Serletic – arranger, keyboards, producer, programming
- The Section Quartet – strings
- Andrew Schubert – mixing
- Nicole Scherzinger – composer
- John Salvatore Scaglione – guitar
- Stefanie Ridel – composer
- Twiggy Ramirez – composer
- Oscar Ramirez – engineer, vocal engineer
- Ralph Rainger – composer
- Christian Plata – assistant
- Phantom Boyz – arranger, keyboards, producer, programming
- Linda Perry – engineer, producer
- Laura Pergolizzi – composer
- Gordon Peeke – drums, percussion
- Paul III – acoustic bass
- Ray Parker, Jr. – guitar
- Mimi Parker – assistant
- 'Lil' Tal Ozz – assistant
- Geoff Nudell – clarinet
- Michael Neuble – drums
- Luis Navarro – assistant
- Jamie Muhoberac – keyboards
- Jacques Morali – composer
- Dean Mora – horn arrangements, transcription
- Peter Mokran – mixing
- Charlie Midnight – composer
- Jim McMillen – trombone
- Andy Martin – trombone
- Manny Marroquin – mixing
- Marilyn Manson – composer
- Chris Lord-Alge – mixing
- Steve Lindsey – composer, producer
- Mike Leisz – assistant
- Juan Manuel Leguizamón – percussion
- Greg Kurstin – piano
- Oliver Kraus – string arrangements, string engineer, strings
- Leroy Kirkland – composer
- James King – saxophone
- Claude Kelly – composer, vocal producer
- Rick Keller – alto sax
- Nik Karpen – mixing assistant
- Alan Kaplan – trumpet
- Joe Josea – composer
- Jaycen Joshua – mixing
- Tommy Lee James – composer
- Etta James – composer
- Graham Hope – assistant
- Mark Hollingsworth – tenor sax
- Dan Higgins – clarinet, baritone sax
- Tal Herzberg – engineer, Pro-Tools
- Trey Henry – bass
- Erwin Gorostiza – art direction, design
- Eric Gorfain – string arrangements, violin
- Matthew Gerrard – composer, producer
- Jesus Garnica – assistant
- Brian Gardner – mastering
- Chris Galland – assistant
- James Gadson – drums
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