Engineer – Sam HollandEngineer, Edited By [Vocal Editing] – Emily WrightProducer – Max MartinProducer, Drums, Bass, Programmed By, Guitar, Synthesizer – Dr. LukeVocals – Kelly ClarksonWritten-By – L. Gottwald*Written-By, Guitar, Synthesizer – Max MartinWritten-By, Producer [Additional Vocal Production] – Claude Kelly

Bass – Paul BushnellDrums – Josh FreeseEdited By [Digital Editing] – Paul DeCarliEngineer [Additional Engineering] – Hatsukazu "Hatch" Inagaki*Guitar – Phil XKeyboards – Jamie MuhoberacKeyboards, Programmed By – Howard BensonProducer – Howard BensonRecorded By – Mike PlotnikoffRecorded By [Assisted By] – Graham HopeWritten-By – Greg Wells, Kara Dioguardi, Katy Perry

Bass – Paul BushnellDrums – Josh FreeseEdited By [Digital Editing] – Paul DeCarliEngineer [Additional Engineering] – Hatsukazu "Hatch" Inagaki*Guitar – Phil XKeyboards, Programmed By – Howard BensonProducer – Howard BensonRecorded By – Mike PlotnikoffRecorded By [Assisted By] – Graham HopeWritten-By – Jason Halbert, Kelly Clarkson, Mark Lee Townsend

Bass – Paul BushnellDrums – Josh FreeseEdited By [Digital Editing] – Paul DeCarliEngineer [Additional Engineering] – Hatsukazu "Hatch" Inagaki*Guitar – Phil XKeyboards – Jamie MuhoberacKeyboards, Programmed By – Howard BensonProducer – Howard BensonRecorded By – Mike PlotnikoffRecorded By [Assisted By] – Graham HopeWritten-By – Andreas Romdhane, Claude Kelly, Josef Larossi

Guitar – Michael BiancanielloProducer – Louis Biancaniello, Sam WattersWritten-By, Guitar – Dameon ArandaWritten-By, Keyboards, Bass, Programmed By, Recorded By – Louis BiancanielloWritten-By, Producer [Vocal Production], Recorded By – Sam Watters

Guitar – Brian RayProducer – Ryan TedderRecorded By – Joe ZookRecorded By [Assisted By] – Jared NewcombWritten-By – Kelly ClarksonWritten-By, Programmed By, Arranged By, Performer [All Instruments Except Guitar], Recorded By – Ryan Tedder

Drums – Eddie Fisher Guitar [Additional Guitars] – Alain JohannesProducer – Ryan TedderProducer [Additional Production] – Greg OganRecorded By – Craig DurranceRecorded By [Assisted By] – Joe Martino, Mike Rooney, Tom SyrowskiWritten-By – Kelly ClarksonWritten-By, Programmed By, Arranged By, Performer [All Instruments Except Drums And Additional Guitars], Recorded By – Ryan Tedder

Drums – Eddie Fisher Producer – Ryan TedderRecorded By – Craig DurranceRecorded By [Assisted By] – Joe Martino, Mike Rooney, Tom SyrowskiWritten-By – Aimée ProalWritten-By, Programmed By, Arranged By, Electric Guitar, Piano, Strings, Recorded By – Ryan Tedder

Bass, Guitar, Backing Vocals [Background Vocals] – Dameon ArandaProducer – Louis Biancaniello, Sam WattersWritten-By, Keyboards, Programmed By, Recorded By – Louis BiancanielloWritten-By, Producer [Vocal Production], Recorded By – Sam Watters

Bass – Paul BushnellDrums – Josh FreeseEdited By [Digital Editing] – Paul DeCarliEngineer [Additional Engineering] – Hatsukazu "Hatch" Inagaki*Guitar – Phil XKeyboards, Programmed By – Howard BensonProducer – Howard BensonRecorded By – Mike PlotnikoffRecorded By [Assisted By] – Graham HopeWritten-By – Glen Ballard, Katy Perry, Matt Thiessen*

Drums – Aaron SterlingProducer – Ryan TedderRecorded By – Dave Rieley*, Joe Cook Recorded By [Assisted By] – Daniel Piscina*, Jimmy FrysingerWritten-By – Kelly ClarksonWritten-By, Programmed By, Arranged By, Electric Guitar, Recorded By – Ryan Tedder

Bass – Paul BushnellDrums – Josh FreeseEdited By [Digital Editing] – Paul DeCarliEngineer [Additional Engineering] – Hatsukazu "Hatch" Inagaki*Guitar – Phil XKeyboards, Programmed By – Howard Benson, Kim BullardProducer – Howard BensonRecorded By [Assisted By] – Graham HopeWritten-By – Aben Eubanks, Jason Halbert, Kelly Clarkson

Guitar, Bass – Michael BiancanielloKeyboards, Programmed By, Recorded By – Louis BiancanielloProducer – Louis Biancaniello, Sam WattersProducer [Vocal Production], Recorded By – Sam WattersWritten-By – Joakim Åhlund, Kelly Clarkson

Bass – Glenn WorfDrums – Paul LeimGuitar – Thomas Bukovac*Piano – John JarvisProducer – Kelly ClarksonRecorded By – Derek BasonRecorded By [Assisted By] – Chris Asburn*Strings [All Strings] – Jonathan YudkinVocals [All Vocals] – Kelly ClarksonWritten-By – Keri Noble

Bass – Paul BushnellDrums – Josh FreeseEdited By [Digital Editing] – Paul DecarliEngineer [Additional Engineering] – Hatsukazu "Hatch" Inagaki*Guitar – Phil XKeyboards, Programmed By, Recorded By – Howard Benson, Kim BullardProducer – Howard BensonVocals [All Vocals] – Kelly ClarksonWritten-By – Adam Watts, Andy Dodd, Shanna Crooks