That'll Be the Day to End of Message to Scotty in 9 Steps
- That'll Be the Day was based on the song 1941
- 1941 was covered by Cynthia Henderson
- Cynthia Henderson recorded Nobody Cares about the Railroads Anymore
- Nobody Cares about the Railroads Anymore was recorded by The Kojacks
- The Kojacks recorded Life Line
- Life Line was covered by Jimmy Webb
- Jimmy Webb wrote Campo de Encino
- Campo de Encino was sung by Harry Nilsson
- Harry Nilsson wrote End of Message to Scotty