- Macy Gray – vocals, producer, executive producer
- Stephanie Alexander – backing vocals
- Sunshine Anderson – vocals
- Issiah J. Avila – drums
- Erykah Badu – vocals
- Marina Bambino – backing vocals ; percussion
- Steve Baxter – backing vocals ; trombone
- Dawn Beckman – backing vocals
- Printz Board – backing vocals ; horn ; trumpet
- Dustin Boyer – guitar
- Tim Carmon – organ
- Davey Chegwidden – percussion
- Keefus Ciancia – Farfisa synthesizer ; Moog synthesizer ; Whirly organ ; Kurzweil synthesizer
- Marc Cross – backing vocals
- Ronesha Davis – children's choir
- Brian J. Durack – organ
- Mike Elizondo – bass
- Paloma Elsesser – children's choir
- Fannie Franklin – backing vocals
- John Frusciante – guitar
- Herb Graham, Jr. – drums
- Kiilu Grand – co-producer ; scratches
- Lili Haydn – strings
- Aanisah Hinds – children's choir
- Mel Hinds – children's choir
- Victor Indrizzo – drums
- Shawki Jibri – children's choir
- Darren Johnson – Rhodes piano
- Kaya Tafari Joseph – children's choir
- Gabby Lang – sitar
- Jinsoo Lim – guitar
- Jane Lopez – backing vocals
- Arik Marshall – guitar
- Lonnie "Meganut" Marshall – bass
- Vlado Meller – mastering
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- Mos Def – rap
- Dion Murdock – drums
- Darice Murphy – children's choir
- Audra Nishita – backing vocals
- Tim "Izo" Orindgreff – backing vocals ; clarinet ; flute ; saxophone
- Billy Preston – claves ; organ
- Zac Rae – Chamberlin keyboards ; Casio synthesizer ; Stylophone ; Rhodes piano ; guitar ; piano ; organ ; Moog synthesizer ; synthesizer, Whirly organ ; Wurlitzer synthesizer, clarinet
- Tom Ralls – trombone
- Rick Rubin – producer, executive producer
- Thom Russo – backing vocals, mixing
- Jeremy Ruzumna – organ ; piano ; Moog synthesizer ; claves ; synthesizer, voice ; Whirly organ
- Raphael Saadiq – co-producer, guitar, strings
- Slick Rick – rap
- Sunnie Shawn – children's choir
- Sy Smith – backing vocals
- Angie Stone – vocals
- Darryl Swann – engineer, programming ; guitar ; strings ; percussion ; backing vocals
- Ahmir "Questlove" Thompson – co-producer, mixing ; drums ; percussion
- Charles Veal, Jr. – strings
- Frank "Knuckles" Walker – percussion
- Lejon Walker – backing vocals
- Tracy Wannamoe – clarinet
- Dave Way – mixing
- Latina Webb – backing vocals
- David Wilder – bass
- Pamela Williams – backing vocals
- James Wooten – organ
- Ericka Yancey – backing vocals
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