Conversation so far:
When did Louis Armstrong move to Chicago?
In 1922, Armstrong joined the exodus to Chicago, where he had been invited by his mentor, Joe "King" Oliver, to join his Creole Jazz Band.
What was his first gig in Chicago?
Oliver's band was among the most influential jazz bands in Chicago in the early 1920s, at a time when Chicago was the center of the jazz universe.
What did the critics say of Armstrong's playing?
CANNOTANSWER.
What songs was he famous for?
CANNOTANSWER.
Are there any other interesting aspects about this article?
Armstrong enjoyed working with Oliver, but Louis' second wife, pianist Lil Hardin Armstrong, urged him to seek more prominent billing and develop his newer style.

Question: When did he start his own band?
Self-contained rewrite: When did Louis Armstrong start his own band?