Mexico City to Doris Day in 9 Steps
- Mexico City was published by Black Molasses Music
- Black Molasses Music published These Are the Brave
- These Are the Brave was written by Perry Botkin
- Perry Botkin wrote Shady Lane
- Shady Lane was written by Harry Nilsson
- Harry Nilsson sang It Had to Be You
- It Had to Be You was written by Gus Kahn
- Gus Kahn is played in I'll See You in My Dreams by Danny Thomas
- Danny Thomas recorded a duet of "Makin' Whoopee" with Doris Day