Unfortunately, as most musicians at his age, he probably has some issues in hearing and then in this kind of acoustic environment where sound is not so clear, it is not easy to follow the grand in perfect pitch - at the same time you are singing yourself, loud. Note, Elvis is not using ear monitors, just traditional speakers in front of him, and grand is on the right. Not the easiest environment for anybody, and if you have any hearing issues, it is quite complicated really. Important thing is to understand yourself where you go - when the performance is on acceptable limits, and when it is not anymore. We have to forgive part of it in case of these old performers - if we wish to see them still.

he went bald !