In the 1930s, black musicians saw option D: the market for their work disappear entirely.
When World War 1 broke out, the country was woefully unprepared. Banks were mostly unregulated and uninsured. When people stopped earning money, they stopped spending because the government provided no insurance or compensation for the unemployed. The consumer economy collapsed, and what had been a routine recession turned into the Great Depression, which came to symbolise the 1930s. Therefore, black musicians too were not able to attract audiences for their market. This implies that option d is the correct one.
People still need to be entertained amid difficult times and conflict. Big bands and swing music were very popular in the 1930s, and Duke Ellington, Benny Goodman, and Glenn Miller were well-known bandleaders. Band singers like Sarah Vaughan and Frank Sinatra went solo as the bands began to disband in the 1940s. Popular wartime music emerged.
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