American Top 40 (AT40) is a long-running syndicated radio program in the United States that counts down the top 40 popular songs of the week based on data from the Billboard Hot 100 chart. The program was created by radio personality Casey Kasem and first aired in 1970.
In each episode of American Top 40, the host (currently Ryan Seacrest) presents the top 40 songs in descending order, with the top song of the week revealed at the end of the show. The program also includes artist interviews, music news, and listener dedications.
The popularity of American Top 40 has made it one of the most influential and recognized chart shows in the world. The program is broadcast on hundreds of radio stations around the United States and in several countries worldwide. It has also had a significant impact on the music industry, as its rankings can affect an artist’s popularity and sales.
Over the years, several radio personalities have hosted American Top 40, including Kasem, Shadoe Stevens, and Seacrest. Despite changes in hosts and music tastes, the program has remained a staple of American radio and a source of entertainment and information for music fans.