Leona Lewis – Glassheart

Backing Vocals – Ladonna Harley-Peters
Co-producer – Chris Loco
Engineer – Beatriz Artola
Management [Naughty Boy Management] – Dancin' Danny D
Management [Naughty Boy Management] – Riki Bleau
Management [Naughty Boy Management] – Tim Blacksmith (3)
Piano, Keyboards, Drums, Percussion – Fraser T Smith
Producer [Additional Production] – Orlando Tucker
Producer [For Delirious Blacksmith Mgmt Ltd] – Naughty Boy (3)
Producer [For MyAudiotonic Productions Ltd] – Fraser T Smith
Programmed By [Programming] – Chris Loco
Programmed By [Programming] – Fraser T Smith
Programmed By [Programming] – Orlando Tucker
Recorded By – Seth Waldmann
Recorded By – Beatriz Artola
Written-By – Leona Lewis
Written-By – Shahid Khan
Written-By – Harry Craze
Written-By – Fraser T Smith
Written-By – Emeli Sandé
Written-By – Mustafa Omer
Written-By – Hugo Chegwin
Written-By – James Murray (3)

Backing Vocals – Ladonna Harley-Peters
Backing Vocals – Eemia
Bass Guitar – Fraser T Smith
Drums – Ash Soan
Engineer – Beatriz Artola
Keyboards, Programmed By [Programming] – Chris Loco
Keyboards, Programmed By [Programming] – Fraser T Smith
Producer [For Loco Productions Ltd] – Chris Loco
Producer [For MyAudiotonic Productions Ltd] – Fraser T Smith
Recorded By [Additional Vocals] – Seth Waldmann
Written-By – Leona Lewis
Written-By – Kelly Sheehan
Written-By – Fraser T Smith
Written-By – Bonnie McKee

Engineer – Ryan Williams
Producer – Ammo (7)
Producer – Oligee
Producer – Josh Abraham
Written-By – Lukasz Gottwald
Written-By – Bonnie McKee
Written-By – Joshua Coleman

Backing Vocals – Ladonna Harley-Peters
Backing Vocals – Ina Wroldsen
Drum Programming – Chris Loco
Drum Programming – Fraser T Smith
Engineer – Beatriz Artola
Guitar, Keyboards – Chris Loco
Guitar, Keyboards – Fraser T Smith
Producer [Additional Production] – Tim Deluxe
Producer [For Loco Productions Ltd] – Chris Loco
Producer [For MyAudiotonic Productions Ltd] – Fraser T Smith
Violin – Sally Jackson
Written-By – Fraser T Smith
Written-By – Ina Wroldsen

Arranged By [Strings], Conductor [Strings] – Guy Farley
Engineer – Alex Graupera
Engineer – Seth Waldmann
Engineer – Craigie Dodds
Engineer – Jack Guy
Engineer – Charlie Hugall
Engineer ["Lips Choir"] – Charlie Hugall
Engineer [Strings] – Ben Georgiades
Mixed By – Mark Stent
Mixed By [Assisted By] – Matty Green (2)
Percussion [Additional Percussion] – Charlie Hugall
Piano, Keyboards [Keys], Guitar, Drums, Programmed By [Programming] – Craigie Dodds
Producer – Craigie Dodds
Written-By – Craigie Dodds

Arranged By [Strings] – Rosie Danvers
Backing Vocals – Emeli Sandé
Backing Vocals – Eemia
Cello – Rosie Danvers
Cello – Bryony James
Double Bass – Steve Mair
Engineer – Beatriz Artola
Engineer [Strings] – Steve Price (6)
Piano, Keyboards, Drums, Programmed By [Programming] – Fraser T Smith
Producer [For Loco Productions Ltd] – Chris Loco
Producer [For MyAudiotonic Productions Ltd] – Fraser T Smith
Strings – Wired Strings
Viola – Bruce White
Viola – Becky Jones (2)
Violin – Kerenza Peacock
Violin – Patrick Kiernan
Violin – Helen Hathorn
Violin – Sarah Sexton
Violin – Jenny Sacha
Violin – Alison Dods
Violin – Debbie Widdup
Violin – Stephanie Cavey
Written-By – Christopher Crowhurst
Written-By – Emeli Sandé

Backing Vocals – Leona Lewis
Backing Vocals – Livvi Franc
Coordinator [Production Co-ordinator] – Kim Lumpkin
Engineer [Assistant Engineer] – Brandon N. Caddell
Guitar – Brent Paschke
Instruments – Rodney Jerkins
Mixed By [2nd Floor Studios] – Rodney Jerkins
Mixed By [2nd Floor Studios] – Matt Champlin
Mixed By [Ninja Beat Club] – Phil Tan
Producer – Rodney Jerkins
Recorded By – Matt Champlin
Sound Designer [Sound Design] – Greg Morgan (4)
Written-By – Leona Lewis
Written-By – Olivia Waithe
Written-By – Rodney Jerkins

Backing Vocals – Leona Lewis
Backing Vocals – Ladonna Harley-Peters
Engineer – Beatriz Artola
Keyboards, Drum Programming – Fraser T Smith
Producer – Fraser T Smith
Recorded By [Vocals] – Seth Waldmann
Written-By – Leona Lewis
Written-By – Jörgen Elofsson
Written-By – Fraser T Smith
Written-By – Rachel Moulden

Engineer – Smith Carlson
Engineer – Seth Waldmann
Engineer [Assisted By] – Alex Graupera
Engineer [Assitant Engineered For Mix] – Phil Seaford
Engineer [Engineered For Mix] – John Hanes
Guitar – Brian Ray
Instruments [Additional Instrumentation] – Ryan Tedder
Instruments [Additional Instrumentation] – Noel Zancanella
Keyboards [Keys], Drums – Darin Whittington
Mixed By – Serban Ghenea
Producer – Ryan Tedder
Producer – Noel Zancanella
Written-By – Leona Lewis
Written-By – Curt Smith
Written-By – Ryan Tedder
Written-By – Noel Zancanella
Written-By – Roland Orzabal
Written-By ["Head Over Heels"] – Curt Smith
Written-By ["Head Over Heels"] – Roland Orzabal

Backing Vocals – Ladonna Harley-Peters
Engineer – Beatriz Artola
Management [Naughty Boy Management] – Dancin' Danny D
Management [Naughty Boy Management] – Riki Bleau
Management [Naughty Boy Management] – Tim Blacksmith (3)
Piano, Keyboards, Programmed By [Programming] – Fraser T Smith
Producer [For Delirious Blacksmith Mgmt Ltd] – Naughty Boy (3)
Producer [For MyAudiotonic Productions Ltd] – Fraser T Smith
Recorded By [Additional Vocal Recording] – Seth Waldmann
Written-By – Luke Juby
Written-By – Shahid Khan
Written-By – Andrea Martin

Bass – Mike Freesh
Co-producer – Fis Shkreli
Co-producer – Noel Zancanella
Co-producer – Brent Kutzle
Drum Programming – Fis Shkreli
Drum Programming – Trent Mazur
Drum Programming – Mike Freesh
Engineer – Smith Carlson
Engineer – Sam Wheat
Engineer – Mike Freesh
Engineer [Assisted By] – Tom Hough
Guitar – Trent Mazur
Instruments [Add'l Instrumentation] – Ryan Tedder
Producer – Frank E (2)
Producer – Ryan Tedder
Sound Designer [Sound Design] – Fis Shkreli
Synth – Trent Mazur
Synth – Mike Freesh
Written-By – Leona Lewis
Written-By – Fis Shkreli
Written-By – Ryan Tedder
Written-By – Justin Franks
Written-By – Noel Zancanella
Written-By – Brent Kutzle
Written-By – Peter Svensson

Backing Vocals – Ladonna Harley-Peters
Engineer – Philip Allen
Engineer – Beatriz Artola
Piano, Keyboards, Drums – Fraser T Smith
Producer – Fraser T Smith
Recorded By [Vocals] – Seth Waldmann
Written-By – Leona Lewis
Written-By – L.P. (3)
Written-By – Fraser T Smith

Backing Vocals – Ladonna Harley-Peters
Co-producer – Chris Loco
Engineer – Beatriz Artola
Featuring – Childish Gambino
Management [Naughty Boy Management] – Dancin' Danny D
Management [Naughty Boy Management] – Riki Bleau
Management [Naughty Boy Management] – Tim Blacksmith (3)
Piano, Keyboards, Drums, Percussion – Fraser T Smith
Producer [Additional Production] – Orlando Tucker
Producer [For Delirious Blacksmith Mgmt Ltd] – Naughty Boy (3)
Producer [For MyAudiotonic Productions Ltd] – Fraser T Smith
Programmed By [Programming] – Chris Loco
Programmed By [Programming] – Fraser T Smith
Programmed By [Programming] – Orlando Tucker
Recorded By – Seth Waldmann
Recorded By – Beatriz Artola
Written-By – Leona Lewis
Written-By – Shahid Khan
Written-By – Harry Craze
Written-By – Fraser T Smith
Written-By – Emeli Sandé
Written-By – Mustafa Omer
Written-By – Hugo Chegwin
Written-By – James Murray (3)