Conversation so far:
What was significant about Willie Dixon adult life?
In 1939, Willie Dixon was a founding member of the Five Breezes, with Caston, Joe Bell, Gene Gilmore and Willie Hawthorne.
What did Willie Dixon do with the Five Breezes?
The group blended blues, jazz, and vocal harmonies, in the mode of the Ink Spots.
How did critics receive Five Breezes?
Are there any other interesting aspects about Willie Dixon's adulthood article?
Willie Dixon's progress on the upright bass came to an abrupt halt with the advent of World War II.

Question: Why did that happen?
Self-contained rewrite: Why did Willie Dixon's progress on the upright bass stop when World War II started?