In “When Broadway Was Black: The Triumphant Story of the All-Black Musical that Changed the World,” author Caseen Gaines explores a revolutionary play that was first introduced to audiences more than a century ago.

The book dives into the production of the 1921 musical “Shuffle Along,” which Gaines points to as a moment that “kick-started the Harlem Renaissance.”

In his research, he said the show opened the door for a run of all-Black performances on Broadway, but over the past century seemed to fade from stages.

In fact, Gaines said he only learned about the show in 2016, when the musical was reimagined and returned to the Great White Way.

Tune in Wednesday morning on NY1, when the next guest in the "Mornings on 1 Authors Week" series stops by.