French music theorists

Victor Charles Paul Dourlen (3 November 1780 – 8 January 1864) was a French composer and music teacher at the Conservatoire de Paris during the first half of the nineteenth century. He is primarily known as a theorist on account of his treatises on harmony, based on the methods of Charles Simon Catel, which were widely used as reference works, especially his Traité d'harmonie (c. 1838), the Traité d'accompagnement pratique (c. 1840), and his Méthode élémentaire pour le pianoforte (c. 1820).

Paul Marie Théodore Vincent d'Indy (French: [vɛ̃sɑ̃ dɛ̃di]; 27 March 1851 – 2 December 1931) was a French composer and teacher. His influence as a teacher, in particular, was considerable. He was a co-founder of the Schola Cantorum de Paris and also taught at the Paris Conservatoire. His students included Albéric Magnard, Albert Roussel, Arthur Honegger, Darius Milhaud, and Erik Satie, as well as Cole Porter.
D'Indy studied under composer César Franck, and was strongly influenced by Franck's admiration for German music. At a time when nationalist feelings were high in both countries (circa the Franco-Prussian War of 1871), this brought Franck into conflict with other musicians who wished to separate French music from German influence.