Mindfulness is meditation in action and involves a "be here now" approach that allows life to unfold without the limitation of pre-judgment. It means being open to an awareness of the moment as it is and to what the moment could hold. It is a relaxed state of attentiveness to both the inner world of thoughts and feelings and the outer world of actions and perceptions.
Music is sound AND silence. It is the spaces BETWEEN the notes that create rhythm, melody, and meaning, and the greater the composer -- and the perfornance -- the better the quality of the silence. Legendary pianist Artur Schnabel said that it wasn't the notes but the silences between them he played better than other people. A few seconds more or less at crucial moments in the performance of a piece may mean the difference between a mundane and a transcendent experience.