Casey's Top 40 was a syndicated radio music program that was distributed by the Westwood One radio network. The show was a vehicle for former American Top 40 host and co-creator Casey Kasem and ran for over nine years. Like Kasem's prior show, Casey's Top 40 aired on weekends, emanated from Hollywood, California, and was a countdown of the 40 biggest hits of the week on the popular music chart. However, unlike American Top 40, this show is not replayed or syndicated, whereas the former is still currently being replayed and syndicated.