Big Band music became popular in the 1920s and 1930s and helped people cope with the difficulties of the Great Depression and World War II. It featured large orchestras playing jazz and dance music. While Big Band's popularity declined after World War II, it saw revivals in popularity and today younger generations are rediscovering artists like Billie Holiday, Frank Sinatra, and Glenn Miller. Big Band music originated in the 1920s and 1930s with bandleaders like Fletcher Henderson, Duke Ellington, and Cab Calloway laying the groundwork before the genre's height during the Swing Era of the late 1930s led by popular bandleaders like Benny Goodman, Harry James, and Tommy Dorsey.