Conversation so far:
What did Casey Kasem have to do with the American Top 40?
Casey Kasem along with Don Bustany, Tom Rounds, and Ron Jacobs, launched the weekly radio program American Top 40. He was co-creator and the host of the show.

Question: When did they launch the program?
Self-contained rewrite: When did Casey Kasem, Don Bustany, Tom Rounds, and Ron Jacobs launch American Top 40?