When Phillips acquired a demo recording of "Without You" and was unable to identify the vocalist, his assistant, Marion Keisker, reminded him about the young truck driver. She called him on May 26, 1954. Presley was not able to do justice to the song (the original acetate of the song that Phillips presented to Elvis resides in the Memphis State University collection), but Phillips asked him to perform some of the many other songs he knew. After running through a few songs, Presley expressed an interest in finding a band to play with, and Phillips invited local Western swing musicians Winfield "Scotty" Moore (electric guitar) and Bill Black (slap bass) to audition Presley. They did so on Sunday, July 4, 1954, at Moore's house. Neither musician was overly impressed, but they agreed a studio session would be useful to explore his potential.