| Person | Type | Job | Role(s) |
|---|---|---|---|
 Lee Loughnane | Crew | Production | Executive Producer, Music Supervisor |
 Robert Lamm | Crew | Production | Executive Producer |
 James Pankow | Crew | Production | Executive Producer |
 Chicago | Crew | Production | Producer, Music |
Walter Parazaider | Crew | Production | Executive Producer |
Peter Curtis Pardini | Crew | Directing | Director, Line Producer, Editor, Producer |
John Honoré | Crew | Camera | Director of Photography |
 Clive Davis | Cast | Actor | |
 David Foster | Cast | Actor | |
 Don Dacus | Cast | Actor | himself (archive footage) |
 Irving Azoff | Cast | Actor | |
James William Guercio | Cast | Actor | himself (archival footage) |
 Joe Mantegna | Cast | Actor | |
Larry Fitzgerald | Cast | ||
Lee Loughnane | Cast | himself | |
 Jimmy Pardo | Cast | ||
 Nick Frangione | Cast | Actor | Jimmy Pankow |
Chris Pinnick | Cast | ||
 Terry Kath | Cast | Actor | himself (archive footage) |
 Peter Cetera | Cast | Actor | himself (archive footage) |
Robert Lamm | Cast | himself | |
James Pankow | Cast | himself | |
 Jason Scheff | Cast | himself | |
 Keith Howland | Cast | ||
 Tris Imboden | Cast | himself | |
Lou Pardini | Cast | ||
Walter Parazaider | Cast | himself | |
 Bill Champlin | Cast | himself (archive footage) | |
Danny Seraphine | Cast | himself | |
 Carlos Amezcua | Cast | Actor | |
Peter Schivarelli | Cast | himself | |
Dawayne Bailey | Cast | himself (archive footage) | |
Walfredo Reyes | Cast | ||
Ned Colletti | Cast | ||
Katherine Muise | Cast | ||
John Honoré | Cast | Terry Kath - Reenactment | |
Jon Cowart | Cast | Robert Lamm | |
Jenna Zillman | Cast | Crowd member | |
Rachael Marie Lau | Cast | Crowd member | |
David Amezcua | Cast | ||
| Person | Type | Job | Role(s) |
