High Quality Content by WIKIPEDIA articles! American Top 40 (commonly abbreviated to AT40) is an internationally-syndicated, independent radio program created by Casey Kasem, Don Bustany, Tom Rounds and Ron Jacobs. Originally a production of Watermark Inc. (later a division of ABC Radio, now Citadel Media), it is now distributed by Premiere Radio Networks in the United States, Canada, Australia, the Philippines, China, India, the United Kingdom, Malaysia and several other territories worldwide. Co-creator Casey Kasem hosted the original AT40 from its inauguration on July 4, 1970 until August 6, 1988, and returned to host the revived version from March 28, 1998 to January 3, 2004. (For much of the interim, he hosted the competing Casey's Top 40.) Its other two regular hosts have been Shadoe Stevens (1988-1995) and current host Ryan Seacrest (since 2004). As of March 2009, AT40 with Seacrest airs in two different formats - one for Contemporary Hit Radio and one for Hot Adult Contemporary stations - with no on-air differentiation other than the charts themselves. Kasem is still heard in two weekly replays of vintage shows from the '70s and '80s, respectively.

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