The virtues of music have long been known to create social cohesion (see Chapter 22) and contribute to individual well-being. What we are now realizing more and more is the full potential of rehabilitation offered by music, especially when motor functions need to be restored. In fact, the rhythmic aspect is at the heart of this potential, of the exploitation of what allows brain plasticity. And in parallel with the possibilities offered by rhythm, time estimation can also be used in some forms of training aimed at physical rehabilitation.