This started to become a moot point by 1972, as most major record labels solidified a trend they had started in the 1960s by putting the same song on both sides of the singles it serviced to radio.
More complex issues began to arise as the typical A-and-B-side format of singles gave way to 12 inch singles and maxi-singles, many of which contained more than one B-side.
A very basic example of this would be the ratio given to sales and airplay.
During the Hot 100's early history, singles were the leading way by which people bought music.
At times, when singles sales were robust, more weight was given to a song's retail points than to its radio airplay.
The Hot 100 quickly became the industry standard and Billboard discontinued the Best Sellers In Stores chart on October 13, 1958.The Top 100 combined all aspects of a single's performance (sales, airplay and jukebox activity), based on a point system that typically gave sales (purchases) more weight than radio airplay.The Best Sellers In Stores, Most Played by Jockeys and Most Played in Jukeboxes charts continued to be published concurrently with the new Top 100 chart.As of the issue for the week ending on April 7, 2018, the Hot 100 has had 1,071 different number one hits.The current number one song is "God's Plan" by Drake.A new chart is compiled and officially released to the public by Billboard on Tuesdays.The first number one song of the Hot 100 was "Poor Little Fool" by Ricky Nelson, on August 4, 1958.The Billboard Hot 100 is the music industry standard record chart in the United States for singles, published weekly by Billboard magazine.Chart rankings are based on sales (physical and digital), radio play, and online streaming.Each chart is post-dated with the "week-ending" issue date four days after the charts are refreshed online (i.e., the following Saturday).The methods and policies by which this data is obtained and compiled have changed many times throughout the chart's history.