- Robert Lamm: Keyboards (2, 3, 5, 6, 8, 11, 12, 14), Vocals (5, 7, 12, 14), Background Vocals
- Terry Kath: Guitars (2, 3, 5, 6, 8, 11, 12, 14), Vocals (3, 6, 8), Background Vocals
- Peter Cetera: Bass (3, 5, 6, 8, 11, 12, 14), Guitar (6), Vocals (1, 2, 4, 6, 11, 15), Background Vocals
- James Pankow: Trombone (3, 4, 5, 6, 7, 10, 11, 12, 14, 15), Brass Arrangements
- Walter Parazaider: Woodwinds (3, 4, 5, 6, 7, 10, 11, 12, 14, 15)
- Lee Loughnane: Trumpet, Flugelhorn (3, 4, 5, 6, 7, 10, 11, 12, 14, 15)
- Danny Seraphine: Drums (2, 3, 4, 5, 6, 8, 9, 11, 12, 13, 14, 15)
- Bill Champlin: Keyboards (7, 10, 13), Vocals (4, 7, 9, 10, 13), Background Vocals
- Jason Scheff: Bass (7, 9, 19, 13), Vocals (7, 13), Background Vocals
- Tris Imboden: Drums (7, 10)
- Keith Howland: Guitars (7, 10)
- Chris Pinnick: Guitars (1, 4, 15)
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