The singles sold well in the Memphis area immediately, and by 1955 were starting to sell well to country audiences throughout the South. Presley, Moore, and Black hit the road with a stage show that grew ever wilder and more provocative, Elvis' swiveling hips causing enormous controversy. The move to all-out rock was hastened by the addition of drums. The last Sun single, "I Forgot to Remember Forget"/"Mystery Train," hit number one on the national country charts in late 1955. Presley was obviously a performer with superstar potential, attracting the interest of bigger labels and Colonel Tom Parker, who became Elvis' manager. In need of capital to expand the Sun label, Sam Phillips sold Presley's contract to RCA in late 1955 for 35,000 dollars; a bargain, when viewed in hindsight, but an astronomical sum at the time.