Chicago to Ian Duck in 7 Steps
- Chicago was written by John Marascalco
- John Marascalco wrote So Proud of You
- So Proud of You was written by Harry Nilsson
- Harry Nilsson wrote You're Breaking My Heart
- You're Breaking My Heart was produced by Richard Perry
- Richard Perry played percussion for Nilsson Schmilsson
- Nilsson Schmilsson includes guitar played by Ian Duck