To dream that you are playing a piano indicates a quest for harmony in your life. Consider where the piano is placed as a clue as to what aspect of your life needs accordance. If no sound is coming out of the piano, then it implies a lack of confidence. You are not sure about how to express yourself and how to voice your beliefs.

To dream that you hear the sound of a piano suggests harmony in your life. You are pleased with the way your life is going. 

To dream that the piano needs to be tuned indicates some aspect of your life is in discord. You need to devote more time to a relationship, family duties, project, or other situation.