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Not really a big deal, I suppose, but few syndicated radio shows have ever had such longevity. According to the linked article below, most radio people thought it would be a disaster and when it debuted, it was only on seven stations.
50 Years Ago, Casey Kasem Began Counting Down The Hits On American Top 40
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KDEO [now KECR] in El Cajon, Ca. was the first station to offically air AT40 on Friday July 3, 1970.
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Used to listen to it on WGRQ and later WPHD. Enjoyed hearing the background on the artists and the Billboard chart trivia that Casey provided.