After chatting with Phillips in the control room, Presley listened to the playback of Perkins's session, which he pronounced to be good. Then he went into the studio and some time later, the jam session began. At some point during the session, Sun artist Johnny Cash, who had recently enjoyed a few hit records on the country charts, arrived as well. (Cash wrote in his autobiography "Cash" that he had been first to arrive at the Sun Studio that day, wanting to listen in on the Perkins recording session.) Jack Clement was engineering that day and remembers saying to himself "I think I'd be remiss not to record this," and so he did. After running through a number of songs, Elvis and girlfriend Evans slipped out as Jerry Lee pounded away on the piano. Cash wrote in "Cash" that "no one wanted to follow Jerry Lee, not even Elvis." Whatever Elvis's feelings may or may not have been in regard to "following" Lewis, Presley was clearly the "star" of the impromptu jam session, which consisted largely of snippets of gospel songs that the four artists had all grown up singing. The recordings show Elvis, the most nationally and internationally famous of the four at the time, to be the focal point of what was a casual, spur-of-the-moment gathering of four artists who would each go on to contribute greatly to the seismic shift in popular music in the late 1950s.