Echo

» Acoustic Guitar, Arranged By, Backing Vocals, Drums, Engineer, Piano, Producer, Programmed By, Written-By: Ryan Tedder
» Cello: Brent Kutzle
» Engineer: Craig Durrance, Joe Zook, Noel Zancanella
» Engineer [Additional]: Damien Lewis
» Engineer [Assistant]: Chris Kasych, Nicolas Essig, Richard Woodcraft
» Mixed By: Phil Tan
» Written-By: E. Kidd Bogart, Leona Lewis

» Backing Vocals [Additional]: Vicky Sandström
» Engineer [Additional]: Damien Lewis
» Guitar [All]: Esbjörn Ohrwall
» Mixed By: Phil Tan
» Producer, Recorded By: Arnthor
» Written-By: Arnthor Birgisson, Max Martin, Savan Kotecha

» Backing Vocals: Che'Nelle
» Co-producer: Harvey Mason, Jr.
» Coordinator [Production Coordination]: Angela N. Golightly
» Engineer: John Hanes
» Engineer [Assistant]: Tim Roberts
» Instruments: Frenchie
» Instruments, Producer: Vein
» Mixed By: Serban Ghenea
» Producer: Uriel "Frenchie" Kadouch
» Recorded By [Additional Vocals]: Dabling Harward
» Recorded By [Vocals, Assistant]: David Boyd, Michael Daley
» Recorded By [Vocals]: Andrew Hey
» Written-By: Cheryline Lim, Gravriel Aminov, Keith Ross, Leona Lewis, Lundon J. Knighten, Michael Malih, Uriel Kadouch

» Bass, Drums, Engineer, Guitar, Producer, Written-By: Julian Bunetta
» Engineer [Additional]: Damien Lewis
» Guitar, Keyboards, Piano, Producer, Written-By: Andrew Frampton
» Mixed By: Phil Tan
» Strings: Christine Wu
» Written-By: Leona Lewis, Savan Kotecha

» Edited By [Pro-Tools, Assistant]: Tim Roberts
» Edited By [Pro-Tools]: John Hanes
» Mixed By: Serban Ghenea
» Producer, Written-By: Max Martin, Shellback
» Recorded By: Ann Mincieli
» Recorded By [Assistant]: Christian Baker
» Written-By: Savan Kotecha

» Arranged By [Choir]: Lawrence Johnson
» Arranged By [Strings], Conductor: Stephen Hussey
» Backing Vocals [Additional]: Stephen Simmonds
» Engineer [Strings], Recorded By [Strings]: Rich Cooper
» Guitar [All]: Esbjörn Ohrwall
» Leader: Simon Fischer
» Mixed By: Manny Marroquin
» Mixed By [Assistant]: Christian Plate, Erik Madrid
» Producer: Arnthor
» Recorded By: Seth Waldmann
» Recorded By [Choir]: Neil Tucker
» Strings: Urban Soul Orchestra
» Written-By: Arnthor Birgisson, Ina Wroldsen

» Edited By: Ron Taylor
» Engineer: John Hanes
» Engineer [Assistant]: Tim Roberts
» Instruments, Producer: Kevin Rudolf
» Mixed By: Serban Ghenea
» Recorded By: Joshua Berkman
» Written-By: J. Kasher, K. Rudolf

» Contractor, Coordinator [Production Coordination]: Shari Sutcliffe
» Drums: Vinnie Colaiuta
» Edited By [Pro-Tools]: Lars Fox
» Engineer [Additional]: Alex Gibson
» Engineer [Assistant]: Keith Armstrong, Nik Karpen, Paul LaMalfa
» Engineer, Programmed By: Jeff Rothschild
» Guitar, Keyboards, Producer, Written-By: John Shanks
» Keyboards: Charles Judge
» Mixed By: Chris Lord-Alge
» Mixed By [Additional]: Andrew Schubert, Brad Townsend
» Programmed By: Dan Chase
» Written-By: Leona Lewis, A. "Novel" Stevenson

» Edited By [Pro-Tools, Assistant]: Tim Roberts
» Edited By [Pro-Tools]: John Hanes
» Instruments, Producer, Recorded By: Shellback
» Mixed By: Serban Ghenea
» Producer, Recorded By, Written-By: Kristian Lundin
» Written-By: Leona Lewis, Savan Kotecha

» Arranged By [Choir]: Lawrence Johnson
» Arranged By [Strings]: Will Malone
» Backing Vocals: Beverley Skeet, Sara-Jane Skeet
» Bass: John Garrison
» Drums: Karl Brazil
» Engineer: Richard Flack
» Engineer [Vocals]: Seth Waldmann
» Guitar: Luke Potashnick
» Mixed By: Jeremy Wheatley
» Piano, Producer: Steve Robson
» Strings: London Session Orchestra, The
» Written-By: Noel Gallagher

» Arranged By [Strings]: Larry Gold
» Co-producer: Mike Elizondo
» Mixed By: Jean-Marie Horvat
» Mixed By [Assistant]: Mimi Parker
» Producer: Y's, The
» Recorded By: Paul Foley
» Written-By: J. Fauntleroy, J. Timberlake, Leona Lewis, M. Elizondo, R. Tadross

» Bass, Guitar, Keyboards, Producer, Written-By: John Shanks
» Contractor, Coordinator [Production Coordination]: Shari Sutcliffe
» Drums: Vinnie Colaiuta
» Edited By [Pro-Tools]: Lars Fox
» Engineer [Assistant]: Keith Armstrong, Nik Karpen, Paul LaMalfa
» Engineer, Programmed By: Jeff Rothschild
» Keyboards: Charles Judge
» Mixed By: Chris Lord-Alge
» Mixed By [Additional]: Andrew Schubert, Brad Townsend
» Written-By: Danielle Brisebois, Leona Lewis

» Arranged By, Backing Vocals, Bass, Drum Programming, Instrumentation By [All Other], Producer, Synth, Written-By: Ryan Tedder
» Arranged By, Co-producer, Piano, Written-By: Dan Muckala
» Bass, Cello, Co-producer, Instrumentation By [All Other], Synth: Brent Kutzle
» Co-producer, Drum Programming, Engineer: Noel Zancanella
» Drums: Eddie Fisher
» Engineer [Additional]: Damien Lewis
» Featuring: OneRepublic
» Mixed By: Phil Tan
» Written-By: Jess Cates, Leona Lewis, Lindy Robbins

» Producer: Arnthor

» Producer: Kevin Rudolf

» Co-producer: Harvey Mason, Jr.
» Producer: Uriel "Frenchie" Kadouch, Vein

» Producer: Max Martin, Shellback

» Producer: Andrew Frampton, Julian Bunetta

» Producer: Arnthor

» Producer: John Shanks

» Co-producer: Mike Elizondo
» Producer: Y's, The

» Producer: Jeff Bhasker

» Producer: John Shanks

» Co-producer: Brent Kutzle, Dan Muckala, Noel Zancanella
» Featuring: OneRepublic

» Featuring: OneRepublic

» Remix: Jason Nevins

» Featuring: OneRepublic

» Featuring: One Republic