1 Till The World Ends
Backing Vocals – Bonnie McKee, Lukasz Gottwald, Max Martin, Myah Marie, Patrizia Rogosch, Sam Holland, Stacey Barnett
Coordinator [Production Coordination] – Clint Gibbs, Irene Richter
Engineer – Emily Wright, Sam Holland
Engineer [Assistant Mix] – Tim Roberts
Engineer [Assistant] – Aniela Gottwald*
Engineer [Mix] – John Hanes
Instruments, Programmed By – Alexander Kronlund, Billboard, Dr. Luke, Max Martin
Mixed By – Serban Ghenea
Producer – Billboard, Dr. Luke, Max Martin
Producer [Vocals] – Emily Wright
Written-By – Alexander Kronlund, Kesha Sebert, Lukasz Gottwald, Max Martin
3:58
2 Hold It Against Me
Backing Vocals – Bonnie McKee, Myah Marie
Co-producer – Billboard
Coordinator [Production Coordination] – Irene Richter, Megan Dennis
Engineer – Emily Wright, Sam Holland
Engineer [Assistant Mix] – Tim Roberts
Engineer [Assistant] – Vezna Gottwald
Engineer [Mix] – John Hanes
Instruments, Programmed By – Billboard, Dr. Luke, Max Martin
Mixed By – Serban Ghenea
Producer – Dr. Luke, Max Martin
Written-By – Bonnie McKee, Lukasz Gottwald, Mathieu Jomphe, Max Martin
3:49
3 Inside Out
Backing Vocals – Bonnie McKee, Myah Marie
Coordinator [Production Coordination] – Clint Gibbs, Irene Richter
Engineer – Emily Wright, Sam Holland
Engineer [Assistant Mix] – Tim Roberts
Engineer [Assistant] – Tatiana Gottwald
Engineer [Mix] – John Hanes
Mixed By – Serban Ghenea
Producer [Additional Vocal Production] – Emily Wright
Producer, Instruments, Programmed By – Billboard, Dr. Luke, Max Martin
Written-By – Bonnie McKee, Jacob Kasher Hindlin, Lukasz Gottwald, Mathieu Jomphe, Max Martin
3:38
4 I Wanna Go
Backing Vocals – Chau Phan
Engineer [Assistant Mix] – Tim Roberts
Engineer [Mix] – John Hanes
Guitar, Bass – Shellback (2)
Mixed By – Serban Ghenea
Producer, Recorded By, Keyboards – Max Martin, Shellback (2)
Written-By – Max Martin, Savan Kotecha, Shellback (2)
3:30
5 How I Roll
Backing Vocals – Bonnie McKee, Nicole Morier
Engineer – Emily Wright, Sam Holland
Engineer [Assistant Mix] – Tim Roberts
Engineer [Assistant] – Eric Eylands
Engineer [Mix] – John Hanes
Mixed By – Serban Ghenea
Producer [Vocals] – Bloodshy, Emily Wright, Henrik Jonback, Magnus*
Producer, Instruments – Bloodshy, Henrik Jonback, Magnus*
Written-By – Bonnie McKee, Christian Karlsson, Henrik Jonback, Magnus Lidehäll, Nicole Morier, Pontus Winnberg
3:37
6 (Drop Dead) Beautiful
Backing Vocals – Ammo (7), Benny Blanco (3), Bonnie McKee, Crystal "Cri$tyle" Johnson*, Esther Dean*, JMIKE, Myah Marie
Coordinator [Production Coordination] – Clint Gibbs, Irene Richter
Engineer – Emily Wright, Sam Holland
Engineer [Assistant Mix] – Tim Roberts
Engineer [Assistant] – Eric Eylands, Jeremy "J Boogs" Levin*
Engineer [Mix] – John Hanes
Featuring – Sabi (2)
Mixed By – Serban Ghenea
Producer [Vocals] – Emily Wright
Producer, Instruments, Programmed By – Ammo (7), Benny Blanco (3), Billboard, JMIKE
Written-By – Benjamin Levin, Esther Dean*, Jeremy Coleman, Joshua Coleman, Mathieu Jomphe
3:36
7 Seal It With A Kiss
Backing Vocals – Bonnie McKee, Sophia Black
Coordinator [Production Coordination] – Clint Gibbs, Irene Richter
Engineer – Emily Wright, Sam Holland
Engineer [Assistant Mix] – Tim Roberts
Engineer [Assistant] – Tatiana Gottwald
Engineer [Mix] – John Hanes
Mixed By – Serban Ghenea
Producer [Additional Vocal Production] – Emily Wright
Producer, Instruments, Programmed By – Dr. Luke, Dream Machine (6), Max Martin
Written-By – Bonnie McKee, Henry Walter, Lukasz Gottwald, Max Martin
3:26
8 Big Fat Bass
Drum Programming [Additional] – DJ Ammo
Featuring, Written-By, Producer, Drum Programming, Piano – Will.i.am*
Mixed By – Dylan "3D" Dresdow*
Recorded By, Engineer – Padraic "padlock" Kerin*, Will.i.am*
Synthesizer – DJ Ammo, Will.i.am*
4:45
9 Trouble For Me
Backing Vocals – Ashton Foster, Heather Bright, Livvi Franc, Myah Marie
Engineer [Assistant Mix] – Tim Roberts
Engineer [Mix] – John Hanes
Mixed By – Serban Ghenea
Producer, Keyboards, Drum Programming – Fraser T Smith
Recorded By – Beatriz Artola
Recorded By [Vocal Recording Assistant] – Eric Eylands
Written-By – Fraser T Smith, Heather Bright, Livvi Franc
3:21
10 Trip To Your Heart
Backing Vocals – Nicole Morier
Engineer – Chris 'TEK' O'Ryan*, Emily Wright, Sam Holland
Engineer [Assistant Mix] – Tim Roberts
Engineer [Assistant] – Eric Eylands
Engineer [Mix] – John Hanes
Mixed By – Serban Ghenea
Producer [Vocals] – Bloodshy, Emily Wright, Henrik Jonback, Magnus*
Producer, Instruments, Programmed By – Bloodshy, Henrik Jonback, Magnus*
Written-By – Christian Karlsson, Henrik Jonback, Magnus Lidehäll, Nicole Morier, Pontus Winnberg, Sophie Stern
3:34
11 Gasoline
Backing Vocals – Bonnie McKee, Claude Kelly, Myah Marie, Sophia Black
Coordinator [Production Coordination] – Clint Gibbs, Irene Richter
Engineer – Emily Wright, Sam Holland
Engineer [Assistant Mix] – Tim Roberts
Engineer [Assistant] – Aniela Gottwald*, Eric Eylands, Jeremy "J Boogs" Levin*, Rob Murray
Engineer [Mix] – John Hanes
Mixed By – Serban Ghenea
Producer [Vocals] – Emily Wright
Producer, Instruments, Programmed By – Benny Blanco (3), Dr. Luke
Written-By – Benjamin Levin, Bonnie McKee, Claude Kelly, Emily Wright, Lukasz Gottwald
3:08
12 Criminal
Backing Vocals – Chau Phan
Engineer [Assistant Mix] – Tim Roberts
Engineer [Mix] – John Hanes
Guitar – Shellback (2)
Mixed By – Serban Ghenea
Producer, Recorded By, Keyboards – Max Martin, Shellback (2)
Written-By – Max Martin, Shellback (2), Tiffany Amber
3:45
13 Up N' Down
Backing Vocals – Bonnie McKee
Engineer – Emily Wright
Engineer [Assistant Mix] – Tim Roberts
Engineer [Mix] – John Hanes
Mixed By – Serban Ghenea
Producer – Max Martin, Oligee, Shellback (2)
Recorded By – Max Martin, Shellback (2)
Written-By – Max Martin, Savan Kotecha, Shellback (2)
3:42
14 He About To Lose Me
Backing Vocals – Britney Spears, Ina Wroldsen, Michaela Shiloh
Engineer [Assistant Mix] – Tim Roberts
Engineer [Assistant] – Eric Weaver
Engineer [Mix] – John Hanes
Guitar – Brent Paschke
Mixed By – Rodney Jerkins, Serban Ghenea
Producer, Producer [Vocal Production], Music By – Rodney "Darkchild" Jerkins*
Recorded By – Mike "Handz" Donaldson*, Orlando Vitto, Tony Mardini
Written-By – Ina Wroldsen, Rodney Jerkins
3:49
15 Selfish
Backing Vocals – Jeanette Olsson, Thaddis "Kuk" Harrell*
Engineer [Assistant Mix] – Tim Roberts
Engineer [Mix] – John Hanes
Instruments – Mikkel S. Eriksen, Sandy Vee, Sandy Vee, Tor Erik Hermansen
Management [Stargate] – Danny D.*, Tim Blacksmith (3)
Mixed By – Serban Ghenea
Producer – Sandy Vee, Stargate (2)
Producer [Vocals] – Kuk Harrell
Recorded By – Mikkel S. Eriksen, Miles Walker, Sandy Vee
Recorded By [Vocals] – Josh Gudwin, Kuk Harrell
Written-By – Esther Dean*, Mikkel S. Eriksen, Sandy Wilhelm, Tor Erik Hermansen, Traci Hale
3:44
16 Don't Keep Me Waiting
Backing Vocals – Britney Spears, Michaela Shiloh
Bass – Thaddaeus Tribbett
Drums [Live] – Travis Barker
Engineer [Assistant Mix] – Tim Roberts
Engineer [Mix] – John Hanes
Guitar – Brent Paschke
Mixed By – Rodney Jerkins, Serban Ghenea
Producer, Producer [Vocal Production], Music By – Rodney "Darkchild" Jerkins*
Recorded By – Mike "Handz" Donaldson*, Orlando Vitto, Tony Mardini
Recorded By [Live Drums] – Chris Holmes
Written-By – Michaela Shiloh, Rodney Jerkins, Thomas Lumpkins
3:21
