American Top 40 was created by Casey Kasem in 1970 and the show became the gold standard of music programming.  Seacrest debuted as host of the program in January 2004, and continued the tradition of counting down the Top 40 songs and interviewing the biggest stars in entertainment.  

Today, American Top 40 with Ryan Seacrest continues to be the #1 countdown show in the world and can be heard on nearly 500 radio stations worldwide including markets such as New York, Los Angeles, Chicago, Dallas, Washington, D.C., Singapore, Toronto, Vancouver, Nairobi, Beijing, Cairo, Sydney, Dubai, and many others.