Jean Rondeau’s monumental survey of the complete works of Louis Couperin is now available on Warner Classics. As Rondeau notes in the booklet, nothing in Couperin’s own hand has survived, and the extant corpus might better be considered a collaborative enterprise among the three Couperin brothers — Louis, François, and Charles, the latter the father of the famous François. It is magnificent, complexly layered music, no matter who the author. Rondeau introduces timbral variety by employing a variety of harpsichords and organs; he also drafts an impressive crew of collaborators, including the singers Anaïs Bertrand, Clotilde Cantau, Cécile Dalmon, and Lucile Richardot. Various Couperin contemporaries are also brought into the fold; Froberger’s Tombeau fait à Paris sur la mort de Monsieur Blancheroche brings disc VII to a shiveringly dark end.