 Once he moved to Saint-Louis, Charpentier virtually ceased writing oratorios and instead primarily wrote musical settings of psalms and other liturgical texts such as the Litanies of Loreto.During his years at Saint-Louis, his works tended to be for large ensembles that included paid singers from the Royal Opera.In addition, during these years Charpentier succeeded Étienne Loulié as music teacher to Philippe, Duke of Chartres.