A few months rolled by, one thing lead to another, and Sam Phillips was talking to his secretary. Sam was the owner, janitor, and chief-cook-and-bottle-washer of Sun Records, and he needed something good to happen to be able to stay in business much longer. She mentioned this twitchy, nervous kid that had recorded a few songs. Sam, with nothing to lose, said 'call him and get him in here.'
Scotty Moore and his Gibson, Bill Black and his doghouse bass, and a high school kid named Elvis.They tried several times over several days, and nothing worked. At the end of another disappointing day in the studio, everybody was getting ready to quit and head home. Elvis grabbed his guitar and started playing this old blues tune, just cutting up. The guys joined in, and Sam, who was in the booth, heard them and thought 'there it is!' He hit record, told them to start over, and within the week the song was on the radio.
The studio version.
An early live version from The Louisiana Hayride.