So I'll start with a well known act, that Lennon screaming his lungs out: Elvis I LOVE YOU (minute 2:49), the guy that once said: before Elvis there was nothing.
Here is Johnny, doing "You ain't nothing but a Hound Dog", at N.Y.'s Madison Square Garden. This is 1972, YES, about a month or so Elvis own stop at the Garden. If Lennon or not was present at Elvis gigs at the MSG in '72 is a matter of debate. What is not is: George Harrison did was, and Lennon, Lennon loved Elvis Presley.