1970s
AT40 debuted on July 4, 1970, and continued to grow through the decade. Several special shows are aired.
1980s
AT40 grows into a phenomenon. The decade that saw Casey leave AT40 and Shadoe Stevens joining as host.
1990s
The show leaves American airwaves in 1994 and ends in 1995. Fortunately, it was resurrected in 1998 with Casey as host.
2000s
Casey retires from AT40 in 2004. Ryan Seacrest takes the reins.
2010s
AT40 continues and enters the streaming world.
2020s
AT40 reaches its 50th Anniversary, with Ryan continuing as host.
