After a spell in which he composed little, Satie entered Paris's second music academy, the Schola Cantorum, as a mature student. His studies there were more successful than those at the Conservatoire. From about 1910 he became the focus of successive groups of young composers attracted by his unconventionality and originality. Among them were the group known as Les Six. A meeting with Jean Cocteau in 1915 led to the creation of the ballet Parade (1917) for Serge Diaghilev, with music by Satie, sets and costumes by Pablo Picasso, and choreography by Léonide Massine.
Satie's example guided a new generation of French composers away from post-Wagnerian impressionism towards a sparer, terser style. Among those influenced by him during his lifetime were Maurice Ravel, Claude Debussy, and Francis Poulenc, and he is seen as an influence on more recent, minimalist composers such as John Cage and John Adams. His harmony is often characterised by unresolved chords, he sometimes dispensed with bar-lines, as in his Gnossiennes, and his melodies are generally simple and often reflect his love of old church music. He gave some of his later works absurd titles, such as Veritables Preludes flasques (pour un chien) ("True Flabby Preludes (for a Dog)", 1912), Croquis et agaceries d'un gros bonhomme en bois ("Sketches and Exasperations of a Big Wooden Man", 1913) and Sonatine bureaucratique ("Bureaucratic Sonatina", 1917). Most of his works are brief, and the majority are for solo piano. Exceptions include his "symphonic drama" Socrate (1919) and two late ballets Mercure and Relâche (1924).
Satie never married, and his home for most of his adult life was a single small room, first in Montmartre and, from 1898 to his death, in Arcueil, a suburb of Paris. He adopted various images over the years, including a period in quasi-priestly dress, another in which he always wore identically coloured velvet suits, and is known for his last persona, in neat bourgeois costume, with bowler hat, wing collar, and umbrella. He is believed to only have had one intimate relationship with another person. A passionate four month affair with the painter Suzanne Valadon (who painted Satie's portrait in 1893-94, shown below).
Despite being a musical iconoclast, and encourager of modernism, Satie was uninterested to the point of antipathy about innovations such as the telephone, the gramophone and the radio. He made no recordings, and as far as is known heard only a single radio broadcast (of Milhaud's music) and made only one telephone call. Although his personal appearance was customarily immaculate, his room at Arcueil was in Orledge's word "squalid", and after his death the scores of several important works believed lost were found among the accumulated rubbish. He was incompetent with money. Having depended to a considerable extent on the generosity of friends in his early years, he was little better off when he began to earn a good income from his compositions, as he spent or gave away money as soon as he received it. He liked children, and they liked him, but his relations with adults were seldom straightforward. One of his last collaborators, Picabia, said of him:
"Satie's case is extraordinary. He's a mischievous and cunning old artist. At least, that's how he thinks of himself. Myself, I think the opposite! He's a very susceptible man, arrogant, a real sad child, but one who is sometimes made optimistic by alcohol. But he's a good friend, and I like him a lot."
Throughout his adult life Satie was a heavy drinker, and in 1925 his health collapsed. He was taken to the Hôpital Saint-Joseph in Paris, diagnosed with cirrhosis of the liver. He died there at 8.00 p.m. on 1 July, at the age of 59. He was buried in the cemetery at Arcueil.