We've unlocked the vault for the very best of Casey Kasem's American Top 40 – '70's Show. For the first time ever, these classic shows are back, all in their original broadcast glory on AM 1220! Listen as Casey shares his incredible behind-the-scenes with the world’s biggest recording stars. Three hours of must-tune radio every Saturday afternoon from noon to 3pm on AM 1220. Today's News. Yesterday's Hits!