- Robert Lamm: Keyboards, Vocals, Background Vocals (CD 1-5: All, DVD: All)
- Terry Kath: Guitars, Vocals, Background Vocals (CD 1-2: All, CD 3: 1-14, DVD: 1-6)
- Peter Cetera: Bass, Vocals, Background Vocals (CD 1-3: All, CD 4: 1-16, DVD: All)
- James Pankow: Trombone, Percussion, Background Vocals (CD 1-5: All, DVD: All)
- Walter Parazaider: Saxophones, Flute, Clarinet, Background Vocals (CD 1-5: All, DVD: All)
- Lee Loughnane: Trumpet, Flugelhorn, Percussion, Background Vocals (CD 1-6: All, DVD: All)
- Danny Seraphine: Drums, Percussion (CD 1-4: All, CD 5: 1-7, DVD: All)
- Laudir De Oliveira: Congas, Percussion (CD 2: 11-19, CD 3: All, CD 4: 1-6)
- Donnie Dacus: Guitars, Vocals, Background Vocals (CD 3: 15-20, CD 4: 1-2, DVD: 7-11)
- Chris Pinnick: Guitars (CD 4: 3-16)
- Dawayne Bailey: Guitars, Background Vocals (CD 5: 1-14)
- Bill Champlin: Keyboards, Guitars, Background Vocals (CD 4: 7-20, CD 5: All)
- Jason Scheff: Bass, Vocals, Background Vocals (CD 4: 17-20, CD 5: All)
- Tris Imboden: Drums, Percussion (CD 5: 8-19)
- Keith Howland: Guitars (CD 5: 16-19)
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