- Robert Lamm: Keyboards (1, 2, 5, 8, 10, 11, 13, 15, 16), Vocals (3, 15), Background Vocals
- Terry Kath: Guitars (1, 2, 5, 10, 11, 13, 15, 16), Vocals (1, 15), Background Vocals
- Peter Cetera: Bass (1, 2, 4, 5, 8, 10, 11, 13, 14, 15, 16), Vocals (1, 2, 4, 5, 8, 10, 11, 13, 14, 15, 16), Background Vocals
- James Pankow: Trombone (1, 2, 3, 7, 8, 9, 10, 11, 12, 13, 16), Brass Arrangements
- Walter Parazaider: Woodwinds (1, 2, 3, 7, 8, 9, 10, 11, 12, 13, 16)
- Lee Loughnane: Trumpet, Flugelhorn (1, 2, 3, 7, 8, 9, 10, 11, 12, 13, 16) Piccolo Trumpet (5)
- Danny Seraphine: Drums (1, 2, 4, 5, 6, 7, 8, 10, 11, 12, 13, 15, 16)
- Bill Champlin: Keyboards (3, 6, 7, 9, 12), Vocals (3, 9), Background Vocals
- Jason Scheff: Bass (3, 6, 7, 9, 12), Vocals (3, 7, 9), Background Vocals
- Tris Imboden: Drums (3, 9)
- Keith Howland: Guitars (3, 9)
- Chris Pinnick: Guitars (14)
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