American Top 40 (previously 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 currently hosted by Ryan Seacrest and presented as an adjunct to his weekday radio program, On Air with Ryan Seacrest. Originally a production of Watermark Inc. (later a division of ABC Radio known as ABC Watermark, now Cumulus Media Networks), American Top 40 is now distributed by Premiere Networks (a division of iHeartMedia). Nearly 500 radio stations in the United States, and several other territories worldwide air American Top 40, making it one of the most listened-to weekly radio programs in the world. It can also be heard on iHeartRadio, TuneIn, and the official American Top 40 applications on mobile smartphones and tablets as well as on Xbox 360, Xbox One, PlayStation 4 consoles (via iHeartRadio's console app), and the Armed Forces Network. GEICO is the main sponsor for the show. More information...
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