Harold Arlen to Louis Armstrong in 9 Steps
- Harold Arlen wrote Over The Rainbow
- Over The Rainbow was produced by Derek Taylor
- Derek Taylor produced Makin' Whoopee
- Makin' Whoopee was written by Gus Kahn
- Gus Kahn wrote It Had to Be You
- It Had to Be You appeared in the film Show Business
- Show Business is a 1944 film starring Eddie Cantor
- Eddie Cantor was the first singer to record Makin' Whoopee!
- Makin' Whoopee! was recorded by many artists including Louis Armstrong