USA #1 Single Song

March 21, 1950 - this was the Billboard top SELLING single. It remained on the top for four weeks until April 15.   It was NOT played most often on radio, in fact it wasn't played much on radio. It was, during the week of April 8, the most played on jukeboxes.

Why didn't radio exploit the trend?

What are jukeboxes? See here.

June 1968 - When I was graduating from high school this was the number one song for the period June 1 to 15.