In this week's edition of of the Gramophone Podcast, Editor Martin Cullingford is joined by the conductor and harpsichordist Christophe Rousset to talk about his new album of Christmas music by the 17th century composer Charpentier - called a Baroque Christmas - recorded with the Monteverdi Choir and English Baroque Soloists, and released on the ensemble's own label, Soli Deo Gloria.