– piano, keyboards Mark Ralph – guitar Greg Collins – bass guitar ; guitar Loren Dawson – keyboards Sean Garrett – backing vocals Neil Kanal – programming ; keyboards Tony Kanal – programming, keyboards Gabrial McNair – keyboards ; trombone, baritone Matt Beck – guitar Pharrell – vocals Kingston James McGregor Rossdale – baby sounds Angelo Moore – saxophone Alex Dromgoole – guitar ; bass guitar David Emery – guitar Stephen Bradley – trumpet, baritone Scheila Gonzalez – saxophone, flute, clarinet Anthony LoGerfo – percussion Ewan Pearson – programming Martin Gore – guitar Richard Hawley – guitar Technical The Neptunes – production Brian Garten – recording Ron Fair – orchestra production Hart Gunther – engineering assistance Mark "Spike" Stent – additional production ; mixing Alex Dromgoole – engineering assistance David Emery – engineering assistance Akon – production Giorgio Tuinfort – co-production Mark "Exit" Goodchild – recording Bojan Dugic – recording Keith Gretlein – recording Kevin Mills – recording ; engineering assistance Yvan Bing – engineering assistance Rich Travali – mixing Nellee Hooper – production Greg Collins – recording ; additional vocal production ; additional vocals recording Ian Rossiter – engineering assistance Swizz Beatz – production Sean Garrett – co-production Angel Aponte – additional recording Glenn Pittman – engineering assistance Steve Tolle – engineering assistance Tony Kanal – production Neil Kanal – recording Colin Mitchell – recording Andrew Alekel – recording Dror Mohar – engineering assistance Andrew Coleman – recording Ryan Kennedy – engineering assistance Phil Tan – mixing Julian Chan – recording Jonathan Merritt – recording Jason Finkel – engineering assistance Simon Gogerly – recording Brian "Big Bass" Gardner – mastering at Bernie Grundman Mastering (Hollywood, California) Artwork Jill Greenberg – photography, fine art concept Jolie Clemens – art direction, layout Nicole Frantz – photography, art and packaging coordination Cindy Cooper – photography, art and packaging coordination Charts Weekly charts Year-end charts Certifications Release history Notes References 2006 albums Albums produced by Akon Albums produced by Nellee Hooper Albums produced by the Neptunes Albums produced by Sean Garrett Albums produced by Swizz Beatz Albums recorded at Capitol Studios Albums recorded at Electric Lady Studios Gwen Stefani albums Interscope Geffen A&M Records albums Interscope Records albums