Prof. Diego Cossu is the best known Phoniatrician in the World, just think that music stars such as Bono of U2, Madonna and many others entrust the care of their voices to him. He wished for a decoration on the wall of the entrance to his new studio in Turin, representing the birth of music : and here is the Tree of Music in the shape of a pentagram, rising from the Earth and releasing notes into the air, without boundaries.