Moore played electric on the eighteen epochal sides Elvis Presley cut for Sun Records in 1954 and '55, including "That's All Right," "Good Rockin' Tonight" and "Mystery Train." His mix of country picking and bluesy bends would later be termed rockabilly. When the King signed with RCA, Moore went along with him, and the result was another round of classics: "Heartbreak Hotel," "Hound Dog," "Too Much" (the last featuring a particularly angular Moore solo). Later, Elvis would turn to Nashville and L.A. session guitarists, but when he wanted to reconnect with his roots for his 1968 comeback special, Moore got the call once again.