A friend of mine recommended this book for me a few months back, and I found it to be incredibly informative and entertaining: Black Broadway: African Americans on the Great White Way by Stewart F. Lane. It has a lot of fascinating information and includes a lot of really cool pictures.
Other recommendations I have (which are great for anyone who wants to learn more about the Theater history in New York City) include: Lost Broadway Theaters by Nicholas van Hoogstraten, Music in German Immigrant Theater: New York City, 1840-1940 by John Koegel, It Happened on Broadway: An Oral History of the Great White Way by Myrna Katz Frommer, and Razzle Dazzle: The Battle for Broadway by Michael Riedel.
I hope some of those recommendations pique your interest. I’m curious, what books would you recommend?