Conversation so far:
What was significant about Willie Dixon's adult life?
In 1939, Dixon was a founding member of the Five Breezes.
What did the Five Breezes do?
The group blended blues, jazz, and vocal harmonies, in the mode of the Ink Spots.
How did critics receive them?
CANNOTANSWER.
Are there any other interesting aspects about this article?
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 progress came to an abrupt halt?