This is the "pièces" that show Marais’ mastery in interpreting with great originality the resources of the jeu d’harmonie, in a variety of technical solutions. These are sometimes vey demanding, ever more associated with stylistic or expressive inventions, also these new and sometimes strange. Still more obvious are the peculiarities of writing and character of these pieces in an execution on solo viol without the support of the basso continuo, integrating it if necessary into the harmony. On the other hand, it is evident how the inclination of Marais approached that of De Machy, who included the viola da gamba (low register), with the harpsichord, lute, theorbo and guitar among the instruments “qui font d’harmonie d’eux-mêmes”, without the need for additional parts.