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The pre-Hot 100 chart "Best Sellers in Stores" listed popular A- and-B-sides together, with the side that was played most often (based on its other charts) listed first.
One of the most notable of these, but far from the only one, was Elvis Presley's "Don't Be Cruel" / "Hound Dog".
The weekly sales period was originally Monday to Sunday, when Nielsen started tracking sales in 1991, but was changed to Friday to Thursday in July 2015.
Radio airplay, which, unlike sales figures and streaming data, is readily available on a real-time basis, and is tracked on a Monday to Sunday cycle (previously Wednesday to Tuesday).
A very basic example of this would be the ratio given to sales and airplay.
The week ending July 28, 1958 was the final publication of the Most Played By Jockeys and Top 100 charts, both of which had Perez Prado's instrumental version of "Patricia" ascending to the top.
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.
During the Presley single's chart run, top billing was switched back and forth between the two sides several times.
But on the concurrent "Most Played in Juke Boxes", "Most Played by Jockeys" and the "Top 100", the two songs were listed separately, as was true of all songs.