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.