- Hans Åkeson – viola
- Timmy Allen – producer
- Tomas Andersson – violin
- Adam Barber – engineer, vocal engineer
- Joe Bates – engineer
- Tim Berkebile – drums, musical director
- Torbjörn Bernhardsson – viola
- Adam Blackburn – engineer
- Daniel Boom – engineer
- Randy Bowland – guitar, guitar (acoustic)
- Nick Carter – arranger, vocals
- Billy Chapin – guitar
- Tom Coyne – mastering
- Asa Forsberg – cello
- Ulf Forsberg – viola
- Andrew Fromm – piano
- Dennis Gallo – guitar, keyboards
- Nick Gamma – art direction, design
- Stephen George – engineer
- Ben Glynne – programming
- Mattias Gustafsson – bass, guitar, keyboards, producer, programming
- Mick Guzauski – mixing
- Paul Howards – keyboards, percussion, saxophone
- Charles Infante – set design
- Henrik Janson – arranger, conductor
- Uli Janson – arranger, conductor
- Bashiri Johnson – percussion
- Devon Kirkpatrick – assistant engineer
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- Robert John "Mutt" Lange – producer
- Tomas Lindberg – bass
- Steve Lipson – producer, programming
- Brian Littrell – conductor, vocal arrangement, vocals
- Kristian Lundin – engineer, mixing, producer
- Max Martin – mixing, producer
- Svein H. Martinsen – viola
- Dominic Miller – guitar
- Chieli Minucci – guitar (acoustic), guitar (electric)
- Heff Moraes – engineer, mixing
- Jackie Murphy – art direction, design
- Edwin Nicholas – bass, keyboards, producer, programming
- Esbjörn Öhrwall – guitar
- Samuli Ornstromer – cello
- Doug Petty – piano
- Rami – mixing
- Elisabeth Arnberg Ranmo – viola
- Dawn Reinholtz – assistant engineer
- Kevin Richardson – arranger, bass, keyboards, vocals
- Carl Robinson – engineer
- Olle Romo – keyboards, programming
- Tom Smith – keyboards
- George Spatta – engineer
- Chris Trevett – engineer, mixing
- Peter-John Vettese – keyboards, programming
- Louie Vigilante – bass
- Georg "Jojje" Wadenius – guitar
- Eric Foster White – bass, conductor, engineer, guitar (electric), keyboards, producer
- Christian "Wicked" Wicht – engineer
- Dan Wojeciechowski – drums
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