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From the age of 14 d'Indy studied harmony with Albert Lavignac. When he was 16 an uncle introduced him to Berlioz's treatise on orchestration, which inspired him to become a composer. He wrote a piano quartet which he sent to César Franck, who was the teacher of a friend. Franck recognised his talent and recommended that d'Indy pursue a career as a composer. At the age of 19, during the Franco-Prussian War, d'Indy enlisted in the National Guard, but returned to musical life as soon as the hostilities were over. He entered Franck's organ class at the Conservatoire de Paris in 1871 remaining there until 1875, when he joined the percussion section of the orchestra at the Châtelet Theatre to gain practical experience. He also served as chorus-master to the Concerts Colonne.