Jason Mraz – Mr. A-Z

Guitar – Jason Mraz
Written-By – Jason Mraz

Bass – Jack Daley
Drums – Nir Zidkyahu
Electric Guitar, Dobro – Lyle Workman
Engineer – Vaughan Merrick
Keyboards – Roger Joseph Manning Jr.
Mixed By – David Thoener
Percussion – Bashiri Johnson
Producer, Acoustic Guitar – Kevin Kadish
Producer, Castanets – Josh Deutsch
Written-By – Kevin Kadish
Written-By – Jason Mraz

Bass – Mike Elizondo
Drums – Ahmir '?uestlove' Thompson
Electric Guitar, Dobro – Lyle Workman
Engineer – Vaughan Merrick
Keyboards, Synthesizer [Moog Bass] – Roger Joseph Manning Jr.
Mixed By – Jim Scott
Producer – Kevin Kadish
Producer – Josh Deutsch
Programmed By – Steve Sidelnyk
Scratches – Bob Necksnapp
Vocals [Spoken Word] – Billy "Bushwalla" Galewood
Written-By – Kevin Kadish
Written-By – Ian Sheridan
Written-By – Jason Mraz
Written-By – Scott Storch

Backing Vocals – Ian Sheridan
Backing Vocals – Adam King
Backing Vocals – Bill Bell
Backing Vocals – Eric Hinojosa
Vocals – Rachael Yamagata
Written-By – Jason Mraz
Written-By – Dan Wilson

Arranged By [Strings] – Ian Sheridan
Cello – Nicole Bayer
Written-By – Lester Mendez
Written-By – Jason Mraz
Written-By – Dennis Morris (2)

Backing Vocals – Danielle Decker
Backing Vocals – Steve Lillywhite
Backing Vocals – Scott Moore (2)
Backing Vocals – Roxanne Oldham
Written-By – Ainslie Henderson
Written-By – Jason Mraz
Written-By – Dennis Morris (2)

Guitar [Nylon] – Raul Midón
Written-By – Jason Mraz
Written-By – Billy "Bushwalla" Galewood

Guitar [Nylon] – Raul Midón
Programmed By – Eric Hinojosa
Vocals [Spoken Word] – Charlie Mingroni
Written-By – Jason Mraz
Written-By – Dennis Morris (2)

Written-By – Jason Mraz
Written-By, Programmed By – Dennis Morris (2)

Guitar [Electric] – Jason Mraz
Written-By – Jason Mraz
Written-By – Eric Hinojosa

Written-By – Jason Mraz
Written-By – Eric Hinojosa

Choir – Lee Davis High School Choir
Electric Guitar, Backing Vocals, Horn [Faux Horn] – Raul Midón
Written-By – Jason Mraz
Written-By – Dan Wilson
Written-By – Dennis Morris (2)
Written-By – Eric Hinojosa