Praise is expressing to God our comprehension and appreciation of His greatness. It is thanking Him for each aspect of His divine nature. (Do you even know what the aspects of His divine nature are?) Our inward attitude becomes outward expression when we praise Him.
And so it is impossible for us to be involved in praise and worship if we are simply watching or listening to someone else do it. Despite however much those things may delight us or stir the good feelings in us, they cannot express our heart for us. No, that we must do by ourselves.