Britney Spears – Circus

Mixed By – Serban Ghenea
Producer – The Outsyders
Producer – K. Briscoe
Recorded By – Brendan Dekora
Recorded By – Bojan Dugić
Recorded By [Additional] – Jim Beanz
Recorded By [Additional] – Marcella Araica
Written-By – Rafael Akinyemi
Written-By – Nikesha Briscoe

Backing Vocals – Claude Kelly
Backing Vocals – Myah Marie
Backing Vocals – Cathy Dennis
Producer, Keyboards, Programmed By, Drums – Benny Blanco (3)
Recorded By – Matt Beckley
Recorded By [Assisted By] – Tatiana Gottwald
Recorded By [Assisted By] – Chris Kasych
Recorded By [Assisted By] – Chad Carlisle
Written-By – Benjamin Levin
Written-By – Claude Kelly
Written-By – Lukasz Gottwald

Backing Vocals – Leah Haywood
Producer, Strings, Keyboards, Programmed By [Drums] – Guy Sigsworth
Recorded By [Assisted By], Mixed By [Assisted By] – Valente Torrez
Recorded By, Mixed By, Acoustic Guitar, Electric Guitar, Guitar [Synth Bass], Programmed By [Drums] – Andy Page
Written-By – Wayne Hector
Written-By – Arnthor
Written-By – Shelly Peiken

Engineer [Pro Tools Editing] – Ron Taylor
Producer – Danja
Producer [Vocals] – Jim Beanz
Recorded By [Assisted By], Mixed By [Assisted By] – Jared Newcomb
Recorded By, Mixed By – Marcella Araica
Written-By – James Washington (2)
Written-By – Luke Boyd
Written-By – Marcella Araica
Written-By – Nate Hills

Backing Vocals – Claude Kelly
Backing Vocals – Windy Wagner
Producer – Benny Blanco (3)
Producer – Dr. Luke
Recorded By – Emily Wright
Recorded By [Assisted By] – Aniella Gottwald
Recorded By [Assisted By] – Chris Kasych
Written-By – Benjamin Levin
Written-By – Claude Kelly
Written-By – Lukasz Gottwald

Backing Vocals – Britney Spears
Backing Vocals – Kinnda
Producer, Programmed By, Backing Vocals – Max Martin
Programmed By – Shellback (2)
Recorded By – Seth Waldmann
Written-By – Alexander Kronlund
Written-By – Savan Kotecha
Written-By – Max Martin
Written-By – Shellback (2)

Backing Vocals – Kasia Livingston
Mixed By – Anders Hvenare
Producer, Keyboards, Programmed By, Recorded By, Mixed By, Bass, Guitar – Bloodshy & Avant
Recorded By – Andrew Wyatt
Recorded By, Guitar [Additional] – Henrik Jonback
Written-By – Kasia Livingston
Written-By – Christian Karlsson
Written-By – Pontus Winnberg
Written-By – Henrik Jonback

Backing Vocals – Luke Boyd
Engineer [Pro Tools Editing] – Ron Taylor
Producer – Danja
Recorded By [Assisted By], Mixed By [Assisted By] – Jared Newcomb
Recorded By, Mixed By – Marcella Araica
Written-By – Marcella Araica
Written-By – Stacy Barthe
Written-By – Nate Hills

Backing Vocals, Producer [Vocals] – Nicole Morier
Guitar – Chris Worthy
Mixed By – Tony Maserati
Producer, Music By, Programmed By – Let's Go To War
Recorded By – Henry Walter
Written-By – Britney Spears
Written-By – Adrian Gough
Written-By – Peter-John Kerr
Written-By – Nicole Morier
Written-By – Henry Walter

Producer – Rob Knox
Producer, Mixed By – Harvey Mason Jr.
Recorded By – Andrew Hey
Recorded By – Dabling Harward
Recorded By [Additional] – David Boyd (4)
Written-By – James Fauntleroy II
Written-By – Britney Spears
Written-By – Harvey Mason Jr.
Written-By – Rob Knox

Backing Vocals – Kesha Sebert
Backing Vocals – Debi Nova
Co-producer – Benny Blanco (3)
Recorded By [Assisted By] – Aniella Gottwald
Written-By – Benjamin Levin
Written-By – Lukasz Gottwald
Written-By – Ronnie Jackson
Written-By – Frankie Storm

Producer – Guy Sigsworth
Recorded By [Assisted By], Mixed By [Assisted By] – Brendan Dekora
Recorded By, Mixed By, Acoustic Guitar, Electric Guitar, Piano, Strings, Synthesizer, Programmed By [Drums] – Andy Page
Written-By – Britney Spears
Written-By – Guy Sigsworth

Backing Vocals – Candice Nelson
Bass, Guitar – Henrik Jonback
Co-producer – The Clutch
Mixed By – Niklas Flyckt
Producer, Keyboards, Programmed By, Recorded By – Bloodshy & Avant
Written-By – Christian Karlsson
Written-By – Pontus Winnberg
Written-By – Ezekiel Lewis
Written-By – Henrik Jonback
Written-By – Patrick J. Que Smith
Written-By – Candice Nelson
Written-By – Balewa Muhammad

Backing Vocals – Kasia Livingston
Mixed By – Tony Maserati
Producer, Instruments, Programmed By, Arranged By – Fernando Garibay
Recorded By – Christian Delano
Recorded By [Assisted By] – George Gumbs
Written-By – Kasia Livingston
Written-By – Fernando Garibay