Answer:
He was performing rock and roll.
Step-by-step explanation:
Elves Presley performed on the Ed Sullivan show on September 9, 1956 for the first time and then again in October 28, 1956, while the final appearance happened on January 7, 1957.
He was until then banned from participating from this show, where he showed the variety of his musical knowledge known at the time as rock and roll.