"Billboard" also changed its Hot 100 policy regarding “two-sided singles” several times. 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." 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. With the initiation of the Hot 100 in 1958, A- and-B-sides charted separately, as they had on the former Top 100.