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.
When did Casey Kasem, Don Bustany, Tom Rounds, and Ron Jacobs launch American Top 40?
Casey Kasem, Don Bustany, Tom Rounds, and Ron Jacobs launched American Top 40 on July 4, 1970.
What else happened with Casey Kasem during the time he launched American Top 40?
In 1983, Casey Kasem helped found the American Video Awards, an annual music video award show taped for distribution to television, which he also hosted and co-produced.
How long did American Top 40 run?
Casey Kasem launched American Top 40 on July 4, 1970 and left the show in 1988.
How many listeners did the show American Top 40 have?
What else is intereting about American Top 40 besides who launched it, when it launched, what happened to Casey Kasem after he leaunched it, and how long it ran?
Casey Kasem mixed in biographical information and trivia about the artists, as well as flashbacks and Long-Distance Dedication segments.

Question: Were there any spin-offs or other shows similar to the Top 40?
Self-contained rewrite: Were there any spin-offs or other shows similar to the American Top 40?