Mac Rebennack to Isham Jones in 13 Steps
- Mac Rebennack is also known as Dr. John
- Dr. John is name checked by Life is a Rock
- Life is a Rock name checks Jeff Barry
- Jeff Barry wrote River Deep-Mountain High
- River Deep-Mountain High was sung by Harry Nilsson
- Harry Nilsson wrote Maybe
- Maybe was covered by The Kojacks
- The Kojacks recorded 1941
- 1941 was recorded by John Randolph Marr
- John Randolph Marr recorded I Wonder Who's Kissing Her Now
- I Wonder Who's Kissing Her Now was arranged by Gordon Jenkins
- Gordon Jenkins arranged It Had to Be You
- It Had to Be You was written by Isham Jones