sentences:  Elvis Presley's double-sided hit "Don't Be Cruel/ Hound Dog," then recognized as the longest-running Number One song of the rock era, spent eleven weeks atop the Billboard Best Sellers chart in 1956, before the 1958 debut of the Hot 100.The previous Hot 100 record was held by Bobby Darin's Mack the Knife, Percy Faith's recording of "Theme from "A Summer Place"" (1960) and The Beatles's "Hey Jude" (1968), all three of which remained at #1 for nine weeks.The ten-week record was matched in 1982 by Olivia Newton-John's "Physical," but was not surpassed until a 1991 change in chart methodology allowed songs to achieve longer reigns at #1.