The pianist Joao Paulo Santos and I have performed the three sonatas recorded on this CD many times in concert. In our view, they are masterpieces of the literature for these two instruments, and, two in particular, those by Freitas Branco and Villa-Lobos, are still little known by music lovers. This seems strange, since the works reflect the incontestable talent of two major composers, one Portuguese, the other Brazilian, who were, in their time, masters of their art. We hope that the interpretations presented here will contribute to greater appreciation for these works.