20th-century classical music in the context of "Aleatory"

Arnold Schoenberg or Schönberg (13 September 1874 – 13 July 1951) was an Austrian and American composer, music theorist, teacher and writer. He was among the first modernists who transformed the practice of harmony in 20th-century classical music, and a central element of his music was its use of motives as a means of coherence. He propounded concepts like developing variation, the emancipation of the dissonance, and the "unity of musical space".

Schoenberg's early works, like Verklärte Nacht (1899), represented a Brahmsian–Wagnerian synthesis on which he built. Mentoring Anton Webern and Alban Berg, he became the central figure of the Second Viennese School. They consorted with visual artists, published in Der Blaue Reiter, and wrote atonal, expressionist music, attracting fame and stirring debate. In his String Quartet No. 2 (1907–1908), Erwartung (1909), and Pierrot lunaire (1912), Schoenberg visited extremes of emotion; in self-portraits he emphasized his intense gaze. While working on Die Jakobsleiter (from 1914) and Moses und Aron (from 1923), Schoenberg confronted popular antisemitism by returning to Judaism and substantially developed his twelve-tone technique. He systematically interrelated all notes of the chromatic scale in his twelve-tone music, often exploiting combinatorial hexachords and sometimes admitting tonal elements.

Igor Fyodorovich Stravinsky (17 June [O.S. 5 June] 1882 – 6 April 1971) was a Russian composer and conductor with French citizenship (from 1934) and American citizenship (from 1945). He is widely considered one of the most important and influential composers of the 20th century and a pivotal figure in modernist music.

Born to a musical family in Saint Petersburg, Russia, Stravinsky grew up taking piano and music theory lessons. While studying law at the University of Saint Petersburg, he met Nikolai Rimsky-Korsakov and studied music under him until the latter's death in 1908. Stravinsky met the impresario Sergei Diaghilev soon after, who commissioned the composer to write three ballets for the Ballets Russes's Paris seasons: The Firebird (1910), Petrushka (1911), and The Rite of Spring (1913), the last of which caused a near-riot at the premiere due to its avant-garde nature and later changed the way composers understood rhythmic structure.

The term string quartet is a type of musical composition or a group of four people who play them. Many composers from the mid-18th century onwards wrote string quartets. The associated musical ensemble consists of two violinists, a violist, and a cellist.

The string quartet was developed into its present form by the Austrian composer Joseph Haydn, whose works in the 1750s established the ensemble as a group of four more-or-less equal partners. Since that time, the string quartet has been considered a prestigious form; writing for four instruments with broadly similar characteristics both constrains and tests a composer. String quartet composition flourished in the Classical era, and Mozart, Beethoven and Schubert each wrote a number of them. Many Romantic and early-twentieth-century composers composed string quartets, including Mendelssohn, Schumann, Brahms, Dvořák, Janáček, and Debussy. There was a slight lull in string quartet composition later in the 19th century, but it received a resurgence in the 20th century, with the Second Viennese School, Bartók, Shostakovich, Babbitt, and Carter producing highly regarded examples of the genre, and it remains an important and refined musical form.

Jean Sibelius (/sɪˈbeɪliəs/; Finland Swedish: [ˈʃɑːn siˈbeːliʉs] ; born Johan Julius Christian Sibelius; 8 December 1865 – 20 September 1957) was a Finnish composer of the late Romantic and early modern periods. He is widely regarded as his country's greatest composer, and his music is often credited with having helped Finland develop a stronger national identity when the country was struggling from several attempts at Russification in the late 19th century.

The core of his oeuvre is his set of seven symphonies, which, like his other major works, are regularly performed and recorded in Finland and countries around the world. His other best-known compositions are Finlandia, the Karelia Suite, Valse triste, the Violin Concerto, the choral symphony Kullervo, and The Swan of Tuonela (from the Lemminkäinen Suite). His other works include pieces inspired by nature, Nordic mythology, and the Finnish national epic, the Kalevala; over a hundred songs for voice and piano; incidental music for numerous plays; the one-act opera The Maiden in the Tower; chamber music, piano music, Masonic ritual music, and 21 publications of choral music.

Karlheinz Stockhausen (German: [kaʁlˈhaɪnts ˈʃtɔkhaʊzn̩] ; 22 August 1928 – 5 December 2007) was a German composer, widely acknowledged by critics as one of the most important but also controversial composers of the 20th and early 21st centuries. He is known for his groundbreaking work in electronic music, having been called the "father of electronic music", for introducing controlled chance (aleatory techniques) into serial composition, and for musical spatialization.

Stockhausen was educated at the Hochschule für Musik Köln and the University of Cologne, later studying with Olivier Messiaen in Paris and with Werner Meyer-Eppler at the University of Bonn. As one of the leading figures of the Darmstadt School, his compositions and theories were and remain widely influential, not only on composers of art music, but also on jazz and popular music. His works, composed over a period of nearly sixty years, eschew traditional forms. In addition to electronic music – both with and without live performers – they range from miniatures for musical boxes through works for solo instruments, songs, chamber music, choral and orchestral music, to a cycle of seven full-length operas. His theoretical and other writings comprise ten large volumes. He received numerous prizes and distinctions for his compositions, recordings, and for the scores produced by his publishing company.

Music historians divide the Western classical music repertory into various eras based on what style was most popular as taste changed. These eras and styles include Medieval, Renaissance, Baroque, Classical, Romantic, Modernist, and Postmodernist. The 20th and 21st centuries are not musical eras in themselves, but are calendar periods that do not relate individually to musical history. However, these two calendar centuries can be combined into a longer musical period that includes the Modernist and Postmodernist eras. Some of the terms, such as "Renaissance" and "Baroque", are borrowed from Western art history. Approximate dates can be assigned to the beginning and ending of each of these eras, which can be useful in describing changes in taste and to estimate the style of a work composed in a particular year. However, these dates are approximate and even good approximations are hard to make.

Olivier Eugène Prosper Charles Messiaen (UK: /ˈmɛsiæ̃/, US: /mɛˈsjæ̃, meɪˈsjæ̃, mɛˈsjɒ̃/; French: [ɔlivje øʒɛn pʁɔspɛʁ ʃaʁl mɛsjɑ̃]; 10 December 1908 – 27 April 1992) was a French composer, organist, and ornithologist. One of the major composers of the 20th century, he was also an outstanding teacher of composition and musical analysis.

Messiaen entered the Conservatoire de Paris at age 11 and studied with Paul Dukas, Maurice Emmanuel, Charles-Marie Widor and Marcel Dupré, among others. He was appointed organist at the Église de la Sainte-Trinité, Paris, in 1931, a post he held for 61 years, until his death. He taught at the Schola Cantorum de Paris during the 1930s. After the fall of France in 1940, Messiaen was interned for nine months in the German prisoner of war camp Stalag VIII-A, where he composed his Quatuor pour la fin du temps (Quartet for the End of Time) for the four instruments available in the prison—piano, violin, cello and clarinet. The piece was first performed by Messiaen and fellow prisoners for an audience of inmates and prison guards. Soon after his release in 1941, Messiaen was appointed professor of harmony at the Paris Conservatoire. In 1966, he was appointed professor of composition there, and he held both positions until retiring in 1978. His many distinguished pupils included Iannis Xenakis, George Benjamin, Alexander Goehr, Pierre Boulez, Jacques Hétu, Tristan Murail, Karlheinz Stockhausen, György Kurtág, and Yvonne Loriod, who became his second wife.

Louis Thomas Hardin (May 26, 1916 – September 8, 1999), known professionally as Moondog, was an American composer, musician, performer, music theoretician, poet and inventor of musical instruments. Largely self-taught as a composer, his prolific work widely drew inspiration from jazz, classical, Native American music which he had become familiar with as a child, and Latin American music. His strongly rhythmic, contrapuntal pieces and arrangements later influenced composers of minimal music, in particular American composers Steve Reich and Philip Glass.

Due to an accident, Moondog was blind from the age of 16. He lived in a small apartment on 44th Street in New York City from the late 1940s until 1972, during which time he was often found on Sixth Avenue, between 52nd and 55th Streets, selling records, composing, and performing poetry. According to the New York Times, he made most of his living begging. He briefly appeared in a cloak and horned helmet during the 1960s and was hence recognized as "the Viking of Sixth Avenue" by passersby and residents who were not aware of his musical career.

Shri Camel is an album by experimental music and classical minimalism pioneer Terry Riley. Riley began composing the work in 1975 on commission from West Germany's Radio Bremen, and performed an early version of the work in Bremen in May 1976. In 1978 Riley recorded a different version of the piece, separated into four suites, at CBS Studios in San Francisco as the final part of a three album deal with CBS; however, CBS did not release the recording until 1980.

For the studio recording, Riley performed the work solo on a modified Yamaha YC-45D combo organ tuned in just intonation and augmented with studio digital delay.