Mexico City to Gus Kahn in 9 Steps
- Mexico City was published by Perryvale Music
- Perryvale Music published Up The Revolution
- Up The Revolution was written by Perry Botkin
- Perry Botkin (the elder) played guitar for Bing Crosby
- Bing Crosby is one of the many artists that recorded Makin' Whoopee!
- Makin' Whoopee! was first recorded by Eddie Cantor
- Eddie Cantor starred in the 1944 film Show Business
- Show Business actors include It Had to Be You
- It Had to Be You was written by Gus Kahn