1920’s were a period that Jazz prospered in Chicago.

This period is generally called “roaring twenties.”  The reason was that Al Capone’s subordinates opened fires even in middle of afternoon

Some people hear "roaring" as "rolling" and some put interesting but wrong translation of “rolling “ for “roaring.”  I do not say whose book, but a book titled with "rolling" is actually available in stores.

Japanese people hardly distinguish to hear the sound of "roaring" and "rolling."  The titles of many songs are translated into Japanese, and among them, some have interesting names.

In Chicago, undergroung bars are engaged with gangster, such bar was called "speakeasy".

[translated by Mariko Ukawa]