Britney Spears - Circus

Mixed By – Serban GheneaProducer – K. Briscoe, The OutsydersRecorded By – Bojan "Genius" Dugic*, Brendan DekoraRecorded By [Additional] – Jim Beanz, Marcella "Ms. Lago" Araica*Written-By – Nikesha Briscoe, Rafael Akinyemi

Backing Vocals – Cathy Dennis, Claude Kelly, Myah MarieProducer, Keyboards, Programmed By, Drums – Benny Blanco Recorded By [Assisted By] – Chad Carlisle, Chris Kasych, Tatiana GottwaldRecorded By [Vocal Editing] – Matt BecklyWritten-By – Benjamin Levin, Claude Kelly, Lukasz Gottwald

Backing Vocals – Leah HaywoodProducer, Strings, Keyboards, Programmed By [Drums] – Guy SigsworthRecorded By [Assisted By], Mixed By [Assisted By] – Valente TorrezRecorded By, Mixed By, Acoustic Guitar, Electric Guitar, Guitar [Synth Bass], Programmed By [Drums] – Andy PageWritten-By – Arnthor Birgisson*, Shelly Peiken, Wayne Hector

Engineer [Pro Tools Editing] – Ron TaylorProducer – DanjaProducer [Vocals] – Jim BeanzRecorded By [Assisted By], Mixed By [Assisted By] – Jared NewcombRecorded By, Mixed By – Marcella "Ms. Lago" Araica*Written-By – James Washington , Luke Boyd, Marcella Araica, Nathaniel Hills*

Backing Vocals – Claude Kelly, Windy WagnerProducer – Benny Blanco , Dr. LukeRecorded By – Emily WrightRecorded By [Assisted By] – Aniela Gottwald*, Chris Kaysch*Written-By – Benjamin Levin, Claude Kelly, Lukasz Gottwald

Backing Vocals – Britney Spears, KinndaProducer, Programmed By, Backing Vocals – Max MartinProgrammed By – Shellback Recorded By – Seth WaldmannWritten-By – Alexander Kronlund, Max Martin, Savan Kotecha, Shellback

Backing Vocals – Kasia LivingstonMixed By – Anders HvenareProducer, Recorded By, Mixed By, Bass, Guitar – Bloodshy & AvantRecorded By – Andrew WyattRecorded By, Guitar [Additional] – Henrik JonbackWritten-By – Christian Karlsson, Henrik Jonback, Kasia Livingston, Pontus Winnberg

Backing Vocals – Luke BoydEngineer [Pro Tools Editing] – Ron TaylorProducer – DanjaRecorded By [Assisted By], Mixed By [Assisted By] – Jared NewcombRecorded By, Mixed By – Marcella "Ms. Lago" Araica*Written-By – Marcella Araica, Nathaniel Hills*, Stacy Barthe

Backing Vocals, Producer [Vocals] – Nicole MorierGuitar – Chris WorthyMixed By – Tony MaseratiProducer, Music By, Programmed By – Let's Go To WarRecorded By – Henry WalterWritten-By – Adrian Gough, Britney Spears, Henry Walter, Nicole Morier, Peter-John Kerr

Producer – Rob KnoxProducer, Mixed By – Harvery Mason, Jr.*Recorded By – Andrew Hey, Dabling HarwardRecorded By [Additional] – David Boyd Written-By – Britney Spears, Harvery Mason, Jr.*, James Fauntleroy II, Rob Knox

Backing Vocals – Debi Nova, Kesha SebertCo-producer – Benny Blanco Recorded By [Assisted By] – Aniela Gottwald*Written-By – Ben Levin*, Frankie Storm, Lukasz Gottwald, Ronnie Jackson

Producer – Guy SigsworthRecorded By [Assisted By], Mixed By [Assisted By] – Brendan DekoraRecorded By, Mixed By, Acoustic Guitar, Electric Guitar, Piano, Strings, Synthesizer, Programmed By [Drums] – Andy PageWritten-By – Britney Spears, Guy Sigsworth

Backing Vocals – Candice NelsonBass, Guitar – Henrik JonbackCo-producer – The ClutchMixed By – Niklas FlycktRecorded By – Bloodshy & AvantWritten-By – Balewa Muhammad, Candice Nelson, Christian Karlsson, Ezekiel Lewis, Henrik Jonback, Patrick J. Que Smith, Pontus Winnberg

Producer [Additional Vocals], Backing Vocals [Additional Vocals], Backing Vocals [Additional] – Nicole MorierProducer, Recorded By, Keyboards, Guitar, Bass, Programmed By – Greg KurstinRecorded By [Vocals] – Brendan DekoraWritten-By – Britney Spears, Greg Kurstin, Nicole Morier

Backing Vocals – Candice NelsonBass [Additional], Guitar [Additional] – Bloodshy & AvantEngineer [Assistant] – Mack BurkhartMixed By – Tony MaseratiProducer – The ClutchRecorded By, Bass, Guitar – Henrik JonbackWritten-By – Balewa Muhammad, Candice Nelson, Christian Karlsson, Ezekiel "Zeke" Lewis*, Henrik Jonback, Patrick "J. Que" Smith*, Pontus Winnberg