As we improvise in music and become increasingly engrossed in the activity, we are intuitively engaged in a playful negotiation of various aesthetic possibilities in the Now. We are in a state where random impulses and irrational, unintentional actions become key premise providers along with everything we have learned through knowledge and experience. This essay reflects on the responsiveness of the Now in musical improvisation. We ask: What does the experience of the Now offer? Does it come with any kind of ethics and accountability and, if so, what kind and to whom does it apply? In our elaborations we are influenced by our own experiences of, and reflections on, compositional and music therapeutic practice. We refer to the theory of musical improvisation and early interaction, and also philosophical texts, especially those by Mikhail Bakhtin. We suggest that the responsiveness of the Now in musical improvisation is a mindset that challenges us both ethically and aesthetically. It does so by seeking creative satisfaction, joy and insight, taking shape through sensory perception that is close to intuition, mimesis and imagination. Its meaning remains unfinalised and foreign to us. It is also risky and is situated on the boundary between music and performer, between performer and other performers, and between the past and future of our actions. The ideal is to strive for a Now that can be experienced as the right now but also as a Now that suits the responses we try to find room for when we improvise.