- Mitch Allan - bass, engineer, guitar, producer, programming
- Brian Barnett - drums
- Julian Bunetta - bass, clapping, drums, engineer, footsteps, instrumentation, keyboards, mixing, producer, string arrangements, vocal producer
- Ken Chastain - percussion, programming
- Dorian Crozier - drums
- Kara DioGuardi - vocals (background)
- John Fields - bass, engineer, guitar, keyboards, mixing, producer, programming
- Andrew Frampton - keyboards
- Serban Ghenea - mixing
- Mark Goldenberg - guitar
- Tina Guo - cello
- David Hodges - engineer, piano, producer, programming
- Jessie James and the Odd Balls- clapping, footsteps, vocals
- Mike Johnson - pedal steel
- Stephen Lu - keyboards, programming
| - Tony Mardini - engineer
- David & Phil Massey - A&R
- Peter Mokran - mixing
- John D. Norten - engineer
- Carlos Oyanedel - mixing assistant
- David Paich - keyboards
- Brent Paschke - guitar
- Katy Perry - vocals (background)
- Eric Peterson - guitar, mixing
- Brian Ray - guitar, guitar (acoustic), slide guitar
- Tim Roberts - mixing assistant
- Mick Schultz - producer
- Adam Shoenfeld - guitar (electric)
- Mark Smidt - horn
- Phil Tan - mixing
- Trey Vittetoe - engineer, mixing, performer, producer
- Billy Watts - guitar
- Glenn Worf - bass
- Jonathan Yudkin - fiddle
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