Conversation so far:
What was Muddy Waters's early career like?
"He brought his stuff down and recorded me right in my house," Muddy recalled.
What happen in 1941?
In August 1941, Alan Lomax went to Stovall, Mississippi, on behalf of the Library of Congress to record various country blues musicians.
What else was he known for in that year?
CANNOTANSWER.
What happen in 1942?
Lomax came back in July 1942 to record him again.
Are there any other interesting aspects about this article?
In 1943, Muddy Waters headed to Chicago.

Question: What did he do in Chicago?
Self-contained rewrite: What did Muddy Waters do in Chicago in 1943?