On July 4, 1970 Casey Kasem hosted “American Top 40” on radio for the first time. I cannot tell a lie; in high school I spent every Sunday afternoon listening to Casey Kasem count down the top 40 songs on Billboard’s Hot 100 Singles chart each week.
The first #1 song on American Top 40’s inaugural 1970 broadcast was “Mama Told Me Not to Come” by Three Dog Night.
We used to get Kasey Casem here in Australia during the 80s as well!