Mixed By – Mark "SPIKE" Stent*Synthesizer [Moog] – Will.I.Am*Written-By – Nicholas Roubanis, Thomas Van Musser

Arranged By [String Arrangement] – Ron FairMixed By – Mark "SPIKE" Stent*Programmed By [Pro Tools] – Tal HerzbergStrings [Mellotron] – Printz BoardViolin [Electric] – Charlie BaccaratWritten-By – Full Force, George Pajon, Jr.*, Indeewar*, Kalyanji Anandji*, Printz Board

Co-producer – DanjaEdited By [Protool], Engineer [Assistant] – Marcella AraicaEngineer – Demo Castellon*Guitar – Kevin RudolfPerformer [All Instruments Except Guitar], Producer, Rap [Ad-libs] – TimbalandScratches [Dj Scratching] – Venus BrownVocals [Pheaturing] – Justin TimberlakeWritten-By – Justin Timberlake, Ante Hills*, Thomas Van Musser, Timothy Mosley

Guitar – Ray BradyMixed By – Mark "SPIKE" Stent*Producer [Additional], Harmonica – Ron FairProgrammed By [Pro Tools] – Tal HerzbergWritten-By – Chris Peters, Drew Peters, Ricky Walters

Clavinet, Organ – Will.I.Am*Written-By – David Payton

Engineer – Ethan Willoughby, Osinachi Nwaneri, Ted HowardMixed By – Ethan WilloughbyPerformer [All Instruments] – Will.I.Am*Rap [Featuring] – Cee-Lo, Q-Tip, Talib KweliVocals [Featuring] – John LegendWritten-By – Anthony Newley, Kamaal Fareed, Leslie Bricusse, Talib Kweli Greene

Backing Vocals [Backgrounds] – Tippa IrieDrums [Live], Keyboards – Keith HarrisGuitar – Ray BradyStrings [Mellotron] – Keith Harris, Printz BoardSynthesizer – Will.I.Am*Synthesizer [Moog] – Printz BoardVocals [Pheaturing] – Dante SantiagoWritten-By – Benjamin Brown, Fitzroy Simpson, George Bennett, Donat Mittoo*, Leroy Sibblis*, Lloyd Ferguson, Printz Board, Ray Brady, Robert Lyn*

Backing Vocals – Dante SantiagoBass, Drums, Strings [Mellotron], Synthesizer – Printz BoardClavinet, Drum Programming, Producer, Strings – Apl.De.Ap*Co-producer – Printz Board, Will.I.Am*Engineer [Vocals] – Dylan DresdowPercussion – Keith HarrisPiano [Rhodes] – Will.I.Am*

Arranged By [Strings], Conductor [Strings] – Ron FairCello – Cecilia Tsan, David Low, Steve Erdody, Suzie KatayamaGuitar, Vocals [Additional], Written-By – Jack JohnsonMixed By – Jack Joseph PuigOrgan [Hammond] – Will.I.Am*Trumpet – Printz BoardViola – Brian Dembow, Matt Funes, Simon Oswell, Vicki MiskolczyViolin – Alan Grunfeld, Bruce Dukov, Charlie Bisharat, Endre Granat, Jackie Brand, Joel Derouin, Josefina Vergara, Julie Gigante, Katia Popov, Mario DeLeon, Natalie Leggett, Phillip Levy, Rene Mandel, Roberto Cani, Sarah Thornblade, Sid Page, Songa Lee*, Tammy Hatwan*

Backing Vocals – The BittersweetsBass – Printz Board, Robert "Mousey" Thompson*Clavinet, Drum Programming, Drums, Organ – Robert "Mousey" Thompson*Guitar – Damon WoodsKeyboards [Ms2000], Piano [Rhodes], Synthesizer [Moog], Trumpet – Printz BoardSaxophone – Jeff WatkinsVocals [Pheaturing] – James BrownWritten-By – Darryl Barnes, Greg Mays, James Brown, Printz Board, Timothy Orindgreff*

Backing Vocals – Dante SantiagoBass, Drum Programming, Engineer – Chaos Clavinet, Piano [Rhodes] – Will.I.Am*Guitar – Michael MatthewsProducer – Noize TripTrumpet – Printz BoardWritten-By – Anthony Tidd, Jean Baptiste , Melvin J. Lewis*, Michael Matthews

Bass, Clavinet, Drum Programming, Guitar, Organ, Percussion – Jimmy LimonSynthesizer – Will.I.Am*

Backing Vocals [Backgrounds] – Dante SantiagoBass – Mike Fratantuono, Printz BoardCo-producer – Will.I.Am*Drum Programming, Keyboards [Mellotron], Producer, Synthesizer, Trumpet – Printz BoardFlute – Tim "Izo" OrindgreffWritten-By – Larry Blackmon, Printz Board, Thomas Jenkins*

Mixed By, Synthesizer – Will.I.Am*Written-By – Keith Harris, Rick James

Bass, Vocals [Pheaturing] – StingDrums – Manu Katche*, Will.I.Am*Keyboards – Kenny KirklandPercussion – Mino CineluSaxophone – Branford MarsalisWritten-By – George Pajon Jr., Sting