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American Top 40
American Top 40
(commonly abbreviated to
AT40
) is an internationally
syndicated
, independent song countdown
radio program
created by
Casey Kasem
,
Don Bustany
,
Tom Rounds
and
Ron Jacobs
. The program is hosted by
Ryan Seacrest
, who took over the program from Kasem upon his 2004 departure. It is currently presented as an adjunct to Seacrest's weekday radio program,
On Air with Ryan Seacrest
.
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