It comes with a pre-course in Tre-B (Trevi), a method originally developed by Riho Tagawa based on the singing methods of Maestro Silvestro and Maestro Iwabuchi.Body, Breath, and Bel Canto are the foundation for creating a beautiful, resonant voice that is unique to the individual.Before you go out into the ocean of world song, you will learn what you cannot do without and discover a voice that is uniquely yours.