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 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), AT40 is now distributed by Premiere Networks in the United States, Canada, Australia, the United Arab Emirates, Singapore, China, India, Sri Lanka, Indonesia, Oman, and several other territories worldwide. It can also be heard on the iHeartRadio, TuneIn, and the official AT40 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.

Subject ID: 64286

More

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 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), AT40 is now distributed by Premiere Networks in the United States, Canada, Australia, the United Arab Emirates, Singapore, China, India, Sri Lanka, Indonesia, Oman, and several other territories worldwide. It can also be heard on the iHeartRadio, TuneIn, and the official AT40 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.

In its early years, the AT40 used the Billboard charts to compile the countdown, touting it as "the only source". The program subsequently switched to being based on Radio and Records airplay data upon its late 1990s return. The current source for the AT40 charts are an unpublished mainstream Top 40 and hot adult contemporary charts compiled by Mediabase.

Subject ID: 64286

Less