Claude Debussy was a French composer. He and Maurice Ravel were the most prominent figures associated with impressionist music, though Debussy disliked the term when applied to his compositions. He was made Chevalier of the Legion of Honour in 1903. He was among the most influential composers of the late 19th and early 20th centuries, and his use of non-traditional scales and chromaticism influenced many composers who followed.
Debussy's music is noted for its sensory content and frequent usage of non-traditional tonalities. The prominent French literary style of his period was known as Symbolism, and this movement directly inspired Debussy both as a composer and as an active cultural participant Among his most famous works are his Clair de Lune, his Three Nocturnes and his orchestral piece La Mer.

Joseph Maurice Ravel was a French composer who is often associated with impressionism along with his elder contemporary Claude Debussy, although both composers rejected the term. In the 1920s and 1930s Ravel was internationally regarded as France's greatest living composer.
Born to a music-loving family, Ravel attended France's premier music college, the Paris Conservatoire; he was not well regarded by its conservative establishment, whose biased treatment of him caused a scandal. After leaving the Conservatoire Ravel found his own way as a composer, developing a style of great clarity, incorporating elements of baroque, neoclassicism and, in his later works, jazz. He liked to experiment with musical form, as in his best-known work, Boléro (1928), in which repetition takes the place of development. He made some orchestral arrangements of other composers' music, of which his 1922 version of Mussorgsky's Pictures at an Exhibition is the best known.
As a slow and painstaking worker, Ravel composed fewer pieces than many of his contemporaries. Among his works to enter the repertoire are pieces for piano, chamber music, two piano concertos, ballet music, two operas, and eight song cycles; he wrote no symphonies and only one religious work. Many of his works exist in two versions: a first, piano score and a later orchestration. Some of his piano music, such as Gaspard de la nuit (1908), is exceptionally difficult to play, and his complex orchestral works such as Daphnis et Chloé (1912) require skilful balance in performance.

Robert Schumann was a German composer and influential music critic. He is widely regarded as one of the greatest composers of the Romantic era. Schumann left the study of law, intending to pursue a career as a virtuoso pianist. He had been assured by his teacher Friedrich Wieck that he could become the finest pianist in Europe, but a hand injury ended this dream. Schumann then focused his musical energies on composing.
Schumann's published compositions were written exclusively for the piano until 1840; he later composed works for piano and orchestra; many Lieder (songs for voice and piano); four symphonies; an opera; and other orchestral, choral, and chamber works. Works such as Carnaval, Symphonic Studies, Kinderszenen, Kreisleriana, and the Fantasie in C are among his most famous. His writings about music appeared mostly in the Neue Zeitschrift für Musik (New Journal for Music), a Leipzig-based publication which he jointly founded.
In 1840, Schumann married Friedrich Wieck's daughter Clara, against the wishes of her father, following a long and acrimonious legal battle, which found in favour of Clara and Robert. Clara also composed music and had a considerable concert career as a pianist, the earnings from which, before her marriage, formed a substantial part of her father's fortune.
Schumann suffered from a mental disorder, first manifesting itself in 1833 as a severe melancholic depressive episode, which recurred several times alternating with phases of ‘exaltation’ and increasingly also delusional ideas of being poisoned or threatened with metallic items. After a suicide attempt in 1854, Schumann was admitted to a mental asylum, at his own request, in Endenich near Bonn. Diagnosed with "psychotic melancholia", Schumann died two years later in 1856 without having recovered from his mental illness.

Source: WikiPedia Alexis-Emmanuel Chabrier (French: [ɛmanɥɛl ʃabʁie]; 18 January 1841 – 13 September 1894) was a Romantic composer and pianist, born in Ambert, central France. His bourgeois family did not approve of a musical career for him, and he studied law in Paris and then worked as a civil servant until the age of thirty-nine while immersing himself in the modernist artistic life of the French capital and composing in his spare time. From 1880 until his final illness he was a full-time composer.

Although known primarily for two of his orchestral works, España and Joyeuse marche, Chabrier left a corpus of operas (including L'étoile), songs, and piano music, but no symphonies, concertos, quartets, sonatas, or religious or liturgical music. His lack of academic training left him free to create his own musical language, unaffected by established rules, and he was regarded by many later composers as an important innovator and a catalyst who paved the way for French modernism. He was admired by, and influenced, composers as diverse as Debussy, Ravel, Richard Strauss, Satie, Stravinsky, and the group of composers known as Les six. Writing at a time when French musicians were generally proponents or opponents of the music of Wagner, Chabrier steered a middle course, sometimes incorporating Wagnerian traits into his music and at other times avoiding them.

Chabrier was associated with some of the leading writers and painters of his time. Among his closest friends was the painter Édouard Manet, and Chabrier collected Impressionist paintings long before they became fashionable. A number of such paintings from his personal collection by artists known to him are now housed in some of the world's leading art museums. He penned a large number of letters to friends and colleagues which offer an insight into his musical opinions and character.

Chabrier died in Paris at the age of fifty-three from a neurological disease, probably caused by syphilis.