Band Personnel
| 1. Member: 1966 - 1978 | |
| Peter Cetera | bg,v |
| Terry Kath | g,v |
| Robert Lamm | kb,v |
| Lee Loughnane | tr,v |
| James Pankow | tromb |
| Walter Parazaider | sax,cl |
| Daniel Seraphine | dr |
| 2. Member: 1978 - 1980 | |
| Peter Cetera | bg,v |
| Donnie Dacus | g,v |
| Robert Lamm | kb,v |
| Lee Loughnane | tr,v |
| James Pankow | tromb |
| Walter Parazaider | sax,cl |
| Daniel Seraphine | dr |
| 3. Member: 1980 - 1982 | |
| Peter Cetera | bg,v |
| Robert Lamm | kb,v |
| Lee Loughnane | tr,v |
| James Pankow | tromb |
| Walter Parazaider | sax,cl |
| Chriss Pinnick | g |
| Daniel Seraphine | dr |
| 4. Member: 1982 - 1986 | |
| Peter Cetera | bg,v |
| Bill Champlin | kb,g,v |
| Robert Lamm | kb,v |
| Lee Loughnane | tr,v |
| James Pankow | tromb |
| Walter Parazaider | sax,cl |
| Chriss Pinnick | g |
| Daniel Seraphine | dr |
| 5. Member: 1986 - | |
| John Keane | dr |
| Robert Lamm | kb,v |
| Lee Loughnane | tr,v |
| James Pankow | tromb |
| Walter Parazaider | sax,cl |
| Chriss Pinnick | g |
| Jason Scheff | bg,v |