American Top 40
| American Top 40 ： ウィキペディア英語版|
''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''.
Originally a production of Watermark Inc. (later a division of ABC Radio, now Cumulus Media Networks), ''AT40'' is now distributed by Premiere Networks in the United States, Canada, Australia, the Philippines, Singapore, China, India, the United Kingdom, Malaysia and several other territories worldwide. It can also be heard on both the iHeartRadio application and the AT40 Mobile application on mobile smartphones and tablets as well as on Xbox 360 and Xbox One consoles.
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''). ''AT40s other two regular hosts have been Shadoe Stevens, who replaced Kasem on the original ''AT40'' and hosted until its 1995 cancellation, and the aforementioned Ryan Seacrest. Currently, ''AT40'' with Seacrest airs in two different formats, with one distributed to Contemporary Hit Radio (Top 40) stations and the other to Adult Contemporary (formerly Hot Adult Contemporary) stations (which were previously served by two different Kasem-hosted shows; see below). There is no differentiation between the Top 40 and AC versions of ''AT40'' made on air. Kasem is still heard in two weekly replays of vintage shows from the '70s and '80s, respectively.
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.〔Durkee, p. 259.〕 Currently the AT40 is based on data from Mediabase, which is also published in the Friday Edition of ''USA Today''. The current #1 song on the Pop version of the chart is Stitches by Shawn Mendes the #1 song on the Hot AC version of the chart is Wildest Dreams by Taylor SWift
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