Black Eyed Peas

will.i.am - vocals on all tracks except 11, backing vocals on track 11, production on all tracks, writing on all tracks, keyboards on tracks 1, 2, 4, 5, 8, 9, 10, 11, 12, and 13, drum programming on tracks 1, 2, 4, 6, 7, 8, 9, and 10. 

apl.de.ap - vocals on tracks 1, 2, 3, 6, 7, 11, 12, 13, 14*, 16*, and 18*, production on track 11, writing on tracks 1, 2, 3, 5, 6, 7, 11, 12, 13, 15*, and 19*, drum programming on track 11. 

Taboo - vocals on tracks 1, 2, 3, 5, 6, 7, 9, and 13, writing on tracks 1, 3, 5, 7, 13, 14*, 17*, and 18*. 

Fergie - vocals on all tracks except 6, 7, and 12, writing on track 9. 

Dante Santiago - vocals on tracks 1 and 7, backing vocals on tracks 3, 4, 6, 10, 15*, and 16*. 

George Pajon - guitar on tracks 1, 3, 5, 6, 7, 8, 10, 13, 15*, 16*, 17*, and 18*. 

writing on tracks 1, 3, 5, 6, 7, 13, and 15*. 

Printz Board - keyboards on track 13, horns on tracks 2, 7, and 14*, writing on tracks 13, 14*, and 16*. 

Mike Fratantuno - bass on tracks 1, 2, 3, 6, 13, 14*, 15*, and 16*, guitar on tracks 7 and 13,

writing on tracks 1, 3, 6, 13, and 15*. 

Terrence Yoshiaki - drums on tracks 3, 7, and 15*, writing on tracks 3 and 15*. 

Keith Harris - drums on track 15*. 

Tim Orindgreff - horns on tracks 2, 7, 14*, and 15*, writing on track 14*. 

Poet Name Life - drum programing on track 15*, production on track 15*, writing on track 15*.

Huck Finn - writing on tracks 2 and 10. 

Jean Baptiste - writing on track 1. 

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Featured Vocalists

Tippa Irie - vocals on track 4, writing on track 4. 

Debi Nova - vocals on track 7, writing on track 7. 

John Legend - vocals on track 10, writing on track 10. 

Justin Timberlake - vocals on track 13, writing on track 13. 

Noelle Scaggs - backing vocals on tracks 3, 6, and 14*. 

Terry Dexter - backing vocals on track 6. 

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Featured Musicians

J. Curtis - guitar on tracks 5, 7, 11, and 13, writing on tracks 5, 7, and 13. 

Ray Brady - guitar on tracks 5 and 9, writing on track 9. 

Chuck Prada - drums on tracks 7 and 16*. 

Ron Fair - piano on track 7, production on tracks 5 and 13.

Davey Chegwidden - drums on track 7. 

Sergio Mendes - piano on track 8. 

Tobin Esperance (Papa Roach) - bass on track 12, writing on track 12. 

Jerry Horton (Papa Roach) - guitar on track 12, writing on track 12. 

David Buckner (Papa Roach) - guitar on track 12, writing on track 12. 

Travis Barker - drums on track 15*.  

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Additional Writers

Billy May - writing on track 1. 

James Brown - writing on track 2. 

Phelps Catfish Collins - writing on track 2. 

William Earl Collins - writing on track 2. 

John Griggs - writing on track 2. 

Clayton Gunnells - writing on track 2. 

Darrel Jamiso - writing on track 2. 

Robert McCullough - writing on track 2. 

Clyde Stubbelefield - writing on track 2. 

Frank Clifford Waddy - writing on track 2. 

Antonio Carlos Jobim - writing on track 8.  

Vincius de Morares - writing on track 8. 

Cesar Banares Jr. - writing on track 11. 

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Management

Polo Molina - group manager. 

Dante Santiago - Creative A&R. 

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