This manuscript, from Christophe Rousset's private collection, was discovered by him in 2004. Dedicated to a Madame de Théobon, it contains not only the essential French harpsichord pieces of the late seventeenth century, but also many transcriptions of compositions by Lully and several hitherto completely unknown preludes. Providing precious insight into the art of the harpsichordist and the musical practices of that time, these pieces are recorded here for the first time. With it's powerful but still austere sound, the Nicolas Dumont harpsichord of 1704 does them full justice.