"That's All Right" (1954)
"Elvis and his band were fooling around at the end of a session at Sun with this song, and Sam Phillips heard it right away. It was a pretty obscure Arthur Crudup song, and it's incredible to me that Elvis knew it. He really put his own whack on it. He sings with a hiccup in the timing – I don't know where that came from. The Sun stuff is really high art. It's so pure, and that sense of discovery is there."