Ludwig van Beethoven was a German composer and pianist. A crucial figure in the transition between the Classical and Romantic eras in Western art music, he remains one of the most famous and influential of all composers. His best-known compositions include nine symphonies, five piano concertos, one violin concerto, 32 piano sonatas, 16 string quartets, his great Mass the Missa solemnis, and one opera, Fidelio. Together with Mozart and Haydn, he was part of the First Viennese School. Born in Bonn, then the capital of the Electorate of Cologne and part of the Holy Roman Empire, Beethoven displayed his musical talents at an early age and was taught by his father Johann van Beethoven and by composer and conductor Christian Gottlob Neefe. At the age of 21 he moved to Vienna, where he began studying composition with Joseph Haydn, and gained a reputation as a virtuoso pianist. He lived in Vienna until his death. By his late 20s his hearing began to deteriorate, and by the last decade of his life he was almost totally deaf. In 1811 he gave up conducting and performing in public but continued to compose; many of his most admired works come from these last 15 years of his life.

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.

Richard Georg Strauss was a leading German composer of the late Romantic and early modern eras. He is known for his operas, which include Der Rosenkavalier, Elektra, Die Frau ohne Schatten and Salome; his Lieder, especially his Four Last Songs; his tone poems, including Don Juan, Death and Transfiguration, and An Alpine Symphony; and other instrumental works such as Metamorphosen and his Oboe Concerto. Strauss was also a prominent conductor in Western Europe and the Americas, enjoying quasi-celebrity status as his compositions became standards of orchestral and operatic repertoire.
Strauss, along with Gustav Mahler, represents the late flowering of German Romanticism after Richard Wagner, in which pioneering subtleties of orchestration are combined with an advanced harmonic style.

George Gershwin was an American composer, who is mostly known due to his combinations of classical and popular music genres.

George Gershwin grew up in a poor neighbourhood in New York. His parents were Russian immigrants who had trouble making ends meet. They did, however, decide to purchase an old piano so Ira Gershwin could study to become a musician. Yet, it turned out not Ira, but his younger brother George showed remarkable talent. Ira applied himself to writing song lyrics and together the Gershwin brothers became absolute greats in the world of 20th century musicals. Nowadays, George's compositions are still relevant, as is evidenced by the many performances of his Rhapsody in Blue from 1924. But the best example is the ageless Summtertime, which has been covered a countless number of times by a countless number of artists.

George Crumb (b. 1929) is one of the most frequently performed composers in today's musical world. Crumb is the winner of Grammy and Pulitzer Prizes, and continues to compose new scores that enrich the lives of all who come in contact with his profoundly humanistic art. Crumb's music often juxtaposes contrasting musical styles, ranging from music of the western art-music tradition, to hymns and folk music, to non-Western musics. Many of Crumb's works include programmatic, symbolic, mystical and theatrical elements, which are often reflected in his beautiful and meticulously notated scores.

(Franz) Joseph Haydn was a prolific Austrian composer of the Classical period. He was instrumental in the development of chamber music such as the piano trio and his contributions to musical form have earned him the epithets "Father of the Symphony" and "Father of the String Quartet".
Haydn spent much of his career as a court musician for the wealthy Esterházy family at their remote estate. Until the later part of his life, this isolated him from other composers and trends in music so that he was, as he put it, "forced to become original". Yet his music circulated widely and for much of his career he was the most celebrated composer in Europe.
He was a friend and mentor of Mozart, a teacher of Beethoven, with whom he formed the First Viennese School. He was also the older brother of composer Michael Haydn.

Francis Jean Marcel Poulenc was a French composer and pianist. Poulenc's wealthy family intended him for a business career in the Rhone Poulenc family company and did not allow him to enrol at a music college. Largely self-educated musically, he studied with the pianist Ricardo Viñes, who became his mentor after the composer's parents died. Poulenc soon came under the influence of Erik Satie, under whose tutelage he became one of a group of young composers known collectively as Les Six. This group of French composers from the 1920s aimed to clear music of the impressionism of Claude Debussy, and German influences such as the Romanticism of Richard Wagner and Richard Strauss. Their motto was "L'art pour l'art": they composed music for the sake of music, without any 'meaning' or extramusical intents. In his early works Poulenc became known for his high spirits and irreverence. During the 1930s a much more serious side to his nature emerged, particularly in the religious music he composed from 1936 onwards, which he alternated with his more light-hearted works.