Scotty Moore described their first session, resulting in the recording of "That's Alright Mama": We were taking a break and, all of sudden, Elvis started singing this song, jumping around and acting the fool. Then Bill Black picked up his bass and began acting the fool too, and I started playing with them. Sam had the door to the control room open, and stuck his head out and said, 'What are you doing?' We said, 'We don't know'. He said, 'Well, back up. Try to find a place to start, and do it again'. So we kinda talked it over and figured out a little bit what we were doin'. We ran it again, and of course Sam is listenin'. 'Bout the third or fourth time through, we just cut it. It was basically a rhythm record. It wasn't any great thing. It wasn't Sam tellin' him what to do. Elvis was joking around, just doing what come naturally, what he felt.