Conversation so far:
When did Jack start performing?
Benny had been a minor vaudeville performer before becoming a national figure with The Jack Benny Program, a weekly radio show that ran from 1932.
What did he do in the Jack Benny Program?
The Jack Benny Program, a weekly radio show that ran from 1932 to 1948 on NBC and from 1949 to 1955 on CBS.
What was the show about?
CANNOTANSWER.
What else can you tell me about his history?
Benny's long radio career began on April 6, 1932, when the NBC Commercial Program Department auditioned him for the N.W.
Ayer agency and their client.

Question: What did he do for the NBC department?
Self-contained rewrite: What did Jack Benny do for the NBC department