Improvisation is defined as the creation of a musical process, as it is being performed. This simple definition exposes how the performance is intrinsic and cannot be dissociated from the Free Music Improvisation practice. This paper will analyse the free improvisation performance and it will show how this musical practice produces new music each time. We will show how improvisers change their performance capabilities for each situation and how they can adapt to all kinds of situations that can arise during the performance. By analysing the performance of the large improvisation ensemble Grand8, the importance of the performance in the improvisation practice will be demonstrated and how crucial it is to the emergence of new music. This paper will examine how the ensemble adapted itself to the pandemic crisis, where the ensemble had to redefine its performances to continue the improvisation practice.