widely in African-American society, peaking in the 1940s.

In 1938, jazz bandleader and singer Cab Calloway published the first dictionary by an African-American, Cab Calloway's Cat-ologue: A "Hepster's" Dictionary, which became the official jive language reference book of the New York Public Library. In 1939, Calloway published an accompanying book titled Professor Cab Calloway's Swingformation Bureau, which instructed readers how to apply the words