I think energy is the most important thing that we can give to people as performers. Anything else is a little bit pretentious. But energy is not.
Some people think that movements, such as the movements in ballet, are a higher cultural expression, whereas some are just dirt. I think it is elitist to think that a trained movement is more acceptable than untrained and possibly unrehearsed movements.
Sometimes I am happy and sometimes not. I am, after all, a human being, you know. And I am glad that we are sometimes happy and sometimes not. You get your wisdom working by having different emotions.
Energy is so important. If you don't have it, don't bother with rock and roll.