text: Eugénie Satie resolved that her elder stepson should become a professional musician, and in November 1879 enrolled him in the preparatory piano class at the Paris Conservatoire. Satie strongly disliked the Conservatoire, which he described as "a vast, very uncomfortable, and rather ugly building; a sort of district prison with no beauty on the inside – nor on the outside, for that matter". He studied solfeggio with Albert Lavignac and piano with Émile Decombes, who had been a pupil of Frédéric Chopin. In 1880 Satie took his first examinations as a pianist: he was described as "gifted but indolent". The following year Decombes called him "the laziest student in the Conservatoire". In 1882 he was expelled from the Conservatoire for his unsatisfactory performance.
  In 1884 Satie wrote his first known composition, a short Allegro for piano, written while on holiday in Honfleur. He signed himself "Erik" on this and subsequent compositions, though continuing to use "Eric" on other documents until 1906. In 1885, he was readmitted to the Conservatoire, in the intermediate piano class of his stepmother's former teacher, Georges Mathias. He made little progress: Mathias described his playing as "Insignificant and laborious" and Satie himself "Worthless. Three months just to learn the piece. Cannot sight-read properly". Satie became fascinated by aspects of religion. He spent much time in Notre-Dame de Paris contemplating the stained glass windows and in the National Library examining obscure medieval manuscripts. His friend Alphonse Allais later dubbed him "Esotérik Satie". From this period comes Ogives, a set of four piano pieces inspired by Gregorian chant and Gothic church architecture.
  Keen to leave the Conservatoire, Satie volunteered for military service, and joined the 33rd Infantry Regiment in November 1886. He quickly found army life no more to his liking than the Conservatoire, and deliberately contracted acute bronchitis by standing in the open, bare-chested, on a winter night. After three months' convalescence he was invalided out of the army.