Kristofer Engelhardt to David T. Walker in 8 Steps
- Kristofer Engelhardt wrote Beatles Undercover
- Beatles Undercover includes a chapter on Harry Nilsson
- Harry Nilsson wrote Without Her
- Without Her was covered by Glen Campbell
- Glen Campbell played guitar for Bongo Rock
- Bongo Rock was arranged by Don Coster
- Don Coster arranged Bongo Rock '73
- Bongo Rock '73 features guitar played by David T. Walker