- John Aguto – assistant engineer
- Ahmed AlHirmi – oud
- Abdulla AlKhalifa – arranger, producer
- Brett Allen – guitar technician
- Paul Arbogast – trombone
- India.Arie – producer
- Jeff B. – keyboards
- Bernie Barlow – backing vocals
- Davis A. Barnett – viola
- Courtney Blooding – project coordinator
- Bill Bottrell – synthesizer, marimba
- Doyle Bramhall II – electric guitar
- Mark Browne – bass
- Andre Burch – engineer
- Branden Burch – keyboards, producer, drum programming, mixing
- Cedric Caldwell – producer
- Jesse Carmichael – keyboards
- Clifford Carter – synthesizer, synthesizer programming
- Dru Castro – engineer
- Ray Chew – arranger, conductor, producer
- Eliza Cho – violin
- James J. Cooper III – cello
- Sheryl Crow – acoustic guitar, vocals
- Vidal Davis – producer, vocal producer
- Kevin Dean – assistant engineer
- Pilar Diaz – backing vocals, musician
- Patrick Dillett – assistant engineer
- Vincent Dilorenzo – engineer, mixing
- Ametria Dock – backing vocals, vocal arrangement
- TJ Doherty – engineer
- Simon "Woodchuck" Durham – bass
- Mike Elizondo – bass, drum programming, sampled guitar
- Melissa Etheridge – guitar, vocals, producer
- James Farber – engineer, mixing
- Sam Farrar – drums, programming, producer, engineer, mixing
- Angela Fisher – choir director
- Gary Fly – assistant engineer
- John Frye – mixing
- Ronald B. Gillyard – voices, A&R, talent coordinator
- Steven Girmant – production coordination
- Tom Gloady – assistant engineer
- Noah Goldstein – assistant
- Berry Gordy, Jr. – advisor, inspiration
- Bonnie Greenberg – leader, A&R, talent coordinator
- Gary "Sugar Foot" Greenberg – leader
- Don Grolnick – organ, synthesizer, piano, producer
- Kevin Hanson – guitar
- Andre Harris – producer, vocal producer
- Henry Hirsch – engineer
- Jennifer Hudson – vocals
- Femi Jiya – engineer, mixing
- Chris Johnson – trumpet, drum programming
- Jimmy Johnson – bass
- Jamar Jones – string arrangements
- Thornell Jones – production coordination
- Padraic Kerin – engineer
- Lenny Kravitz – producer, mixing
- Emma Kummrow – violin
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- Nathaniel Kunkel – assistant engineer
- Jared Kvitka – assistant engineer
- Matthew Boomer La Monica – assistant engineer
- Michael Landau – electric guitar
- James Landry – engineer, mixing
- Adam Lesnick – French horn
- Adam Levine – guitar, vocals
- Fritz Lewak – percussion, drums
- Robert C. Ludwig – mastering
- Mickey Madden – bass
- Bill Malina – engineer
- Will Markwell – engineer
- Maroon 5 – producer
- Robert Martin – violin
- Harvey Mason, Jr. – vocal producer
- Steve McKeever – producer, executive producer
- Thierry Migeotte – mastering, vocal effect
- Katherine Miller – assistant engineer
- Lamar Mitchell – programming
- Peter Nocella – viola
- Jim O'Rourke – string arrangements
- Marvin "Chanz" Parkman – keyboards
- Ila Parvaz – production coordination
- Jon Polk – leader
- K.C. Porter – keyboards, musician
- Aaron Prellwitz – assistant
- Dave Reitzas – vocal engineer
- Jacques Richmond – digital editing
- Pamela Robinson – research, A&R, selection, talent coordinator
- Erik Rostad – violin
- Philip Sayce – guitar, backing vocals
- Jim Scott – mixing
- Ian Shea – assistant
- Rob Skipworth – assistant
- Beau Sorenson – assistant
- Moses Staimez – guitar
- Erik Steigen – A&R, talent coordinator
- Igor Szwec – violin
- Gregory Teperman – violin
- Robin Thicke – vocals
- Ryan Toby – vocal producer, choir arrangement
- Cekoya Tolbert – backing vocals
- Jeff Trott – electric guitar
- Jochem van der Saag – synthesizer, programming, engineer, mixing, sound design
- Carlos Vega – drums
- Dale Voelker – art direction, design
- Bruce Walker – A&R, project manager
- Christopher Walla – producer, engineer
- Rob Wanda – scratching
- Charles Whitfield – coordination
- Alain Whyte – bass, guitar
- will.i.am – piano, drums, producer, engineer, Fender Rhodes, mixing
- Monica Williams – intern
- Lily Wilson – backing vocals
- BeBe Winans – producer
- Oprah Winfrey – executive producer
- Stevie Wonder – arranger, producer
- John Ziemski – assistant
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