Giannis Klearchou Xenakis (also spelled for professional purposes as Yannis or Iannis Xenakis; Greek: Γιάννης "Ιάννης" Κλέαρχου Ξενάκης, pronounced [ˈʝanis kseˈnacis]; 29 May 1922 – 4 February 2001) was a Romanian-born Greek-French avant-garde composer, music theorist, architect, performance director and engineer. After 1947, he fled Greece, becoming a naturalised citizen of France eighteen years later. Xenakis pioneered the use of mathematical models in music such as applications of set theory, stochastic processes and game theory and was also an important influence on the development of electronic and computer music. He integrated music with architecture, designing music for pre-existing spaces, and designing spaces to be integrated with specific music compositions and performances. Among his most important works are Metastaseis (1953–54) for orchestra, which introduced independent parts for every musician of the orchestra; percussion works such as Psappha (1975) and Pléïades (1979); compositions that introduced spatialization by dispersing musicians among the audience, such as Terretektorh (1966); electronic works created using Xenakis's UPIC system; and the massive multimedia performances Xenakis called polytopes, that were a summa of his interests and skills. Among the numerous theoretical writings he authored, the book Formalized Music: Thought and Mathematics in Composition (French edition 1963, English translation 1971) is regarded as one of his most important publications. As an architect, Xenakis is primarily known for his early work under Le Corbusier: the priory of Sainte-Marie de La Tourette, on which the two collaborated, and the Philips Pavilion at the 1958 Brussels World's Fair (Expo 58), which Xenakis designed by himself.

In classical music, a piano quintet is a work of chamber music written for piano and four other instruments, most commonly (since 1842) a string quartet (i.e., two violins, viola, and cello). The term also refers to the group of musicians that plays a piano quintet. The genre flourished during the nineteenth century. Until the middle of the nineteenth century, most piano quintets were scored for piano, violin, viola, cello, and double bass. Following the success of Robert Schumann's Piano Quintet in E♭ major, Op. 44 in 1842, which paired the piano with a string quartet, composers increasingly adopted Schumann's instrumentation, and it was this form of the piano quintet that dominated during the second half of the nineteenth century and into the twentieth century. Among the best known and most frequently performed piano quintets, aside from Schumann's, are Schubert's Trout quintet and the piano quintets of Johannes Brahms, César Franck, Antonín Dvořák and Dmitri Shostakovich.

This article presents a complete list of compositions by Greek composer Iannis Xenakis (1922-2001), organized by instrumentation. Within each category, the works are arranged chronologically by year of composition.

Aroura is a composition for strings by Greek/French composer Iannis Xenakis. It was composed in 1971.

Charisma is a composition for clarinet and cello by Iannis Xenakis.

This article presents a complete list of compositions by Greek composer Iannis Xenakis (1922-2001), organized by instrumentation. Within each category, the works are arranged chronologically by year of composition.

This article presents a complete list of compositions by Greek composer Iannis Xenakis (1922-2001), organized by instrumentation. Within each category, the works are arranged chronologically by year of composition.

This article presents a complete list of compositions by Greek composer Iannis Xenakis (1922-2001), organized by instrumentation. Within each category, the works are arranged chronologically by year of composition.

Theraps is a composition for solo double bass by Iannis Xenakis.

This article presents a complete list of compositions by Greek composer Iannis Xenakis (1922-2001), organized by instrumentation. Within each category, the works are arranged chronologically by year of composition.

A string trio is a group of three string instruments or a piece written for such a group. From at least the 19th century on, the term "string trio" with otherwise unspecified instrumentation normally refers to the combination violin, viola and cello. The classical string trio emerged during the mid-18th century and later expanded into four subgenres: the grand trio, the concertant trio, the brilliant trio, and the Hausmusik trio.

The violoncello ( VY-ə-lən-CHEL-oh, Italian pronunciation: [vjolonˈtʃɛllo]), commonly abbreviated as cello ( CHEL-oh), is a medium-low pitched bowed string instrument of the violin family. Its four strings are usually tuned in perfect fifths: from low to high, C2, G2, D3 and A3. The viola's four strings are each an octave higher. Music for the cello is generally written in the bass clef; the tenor clef and treble clef are used for higher-range passages. Played by a cellist or violoncellist, the instrument enjoys a large solo repertoire with and without accompaniment, as well as numerous concerti. As a solo instrument, the cello uses its whole range, from bass to soprano, and in chamber music, such as string quartets and the orchestra's string section, it often plays the bass part, where it may be reinforced an octave lower by the double basses. Figured bass music of the Baroque era typically assumes a cello, viola da gamba or bassoon as part of the basso continuo group alongside chordal instruments such as organ, harpsichord, lute, or theorbo. Cellos are found in many other ensembles, from modern Chinese orchestras (as a replacement of Gehu 革胡）to cello rock bands.

This article presents a complete list of compositions by Greek composer Iannis Xenakis (1922-2001), organized by instrumentation. Within each category, the works are arranged chronologically by year of composition.

Nomos Alpha (Greek: Νόμος α΄) is a piece for solo cello composed by Iannis Xenakis in 1965, commissioned by Radio Bremen for cellist Siegfried Palm, and dedicated to mathematicians Aristoxenus of Tarentum, Évariste Galois, and Felix Klein. This piece is an example of a style of music called, by Xenakis, symbolic music – a style of music which makes use of set theory, abstract algebra, and mathematical logic in order to create and analyze musical compositions. Along with symbolic music, Xenakis is known for his development of stochastic music. During his lifetime, Xenakis was a vocal critic of modern Western music since the development of polyphony for its diminished set of outside-time structures, especially when compared to folk and Byzantine musical traditions. This perceived incompleteness of Western music was the main impetus for the development of symbolic music and for composing Nomos Alpha, his most well-known example of the genre. Nomos Alpha consists of 24 sections divided into two layers. The first layer consists of every section not divisible by four, while the second layer consists of every fourth section.

This article presents a complete list of compositions by Greek composer Iannis Xenakis (1922-2001), organized by instrumentation. Within each category, the works are arranged chronologically by year of composition.

Okho is a composition for three percussionists by Iannis Xenakis completed in 1989.

This article presents a complete list of compositions by Greek composer Iannis Xenakis (1922-2001), organized by instrumentation. Within each category, the works are arranged chronologically by year of composition.

Pléïades is a composition for six percussionists composed in 1979 by Greek composer Iannis Xenakis, originally commissioned by the percussion ensemble Les Percussions de Strasbourg. It is notable for its use of the sixxen, an instrument Xenakis constructed specifically for the piece.

Psappha (Edition: Salabert, 1975) is a musical composition for multi-percussion solo by Franco-Greek modernist composer Iannis Xenakis. The work does not include specific instrumentation, although the composer calls for three groups of wood and/or skins and three groups of metal instruments. The actual printed performance score is written in a unique graph notation and consists of 2,396 segments. It presents a greater demand on the performer due to this unique style. Together with Rebonds, composed between 1987 and 1989, Psappha is one of the two compositions for solo percussion by Xenakis.

Rebonds is a composition for solo percussion by Greek composer Iannis Xenakis. It was composed between 1987 and 1989 and, together with Psappha, is one of the two compositions for solo percussion by Xenakis.

This article presents a complete list of compositions by Greek composer Iannis Xenakis (1922-2001), organized by instrumentation. Within each category, the works are arranged chronologically by year of composition.

The term string quartet is a type of musical composition or a group of four people who play the quartets. 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. The standard structure for a string quartet as established in the Classical era is four movements, with the first movement in sonata form, allegro, in the tonic key; a slow movement in a related key and a minuet and trio follow; and the fourth movement is often in rondo form or sonata rondo form, in the tonic key. Some string quartet ensembles play together for many years and become established and promoted as an entity in a manner similar to an instrumental soloist or an orchestra.

This is a list of notable events in music that took place in the year 1959.

The term string quartet is a type of musical composition or a group of four people who play the quartets. 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. The standard structure for a string quartet as established in the Classical era is four movements, with the first movement in sonata form, allegro, in the tonic key; a slow movement in a related key and a minuet and trio follow; and the fourth movement is often in rondo form or sonata rondo form, in the tonic key. Some string quartet ensembles play together for many years and become established and promoted as an entity in a manner similar to an instrumental soloist or an orchestra.

This article presents a complete list of compositions by Greek composer Iannis Xenakis (1922-2001), organized by instrumentation. Within each category, the works are arranged chronologically by year of composition.

Theraps is a composition for solo double bass by Iannis Xenakis.

The saxophone (often referred to colloquially as the sax) is a type of single-reed woodwind instrument with a conical body, usually made of brass. As with all single-reed instruments, sound is produced when a reed on a mouthpiece vibrates to produce a sound wave inside the instrument's body. The pitch is controlled by opening and closing holes in the body to change the effective length of the tube. The holes are closed by leather pads attached to keys operated by the player. Saxophones are made in various sizes and are almost always treated as transposing instruments. A person who plays the saxophone is called a saxophonist or saxist. The saxophone is used in a wide range of musical styles including classical music (such as concert bands, chamber music, solo repertoire, and occasionally orchestras), military bands, marching bands, jazz (such as big bands and jazz combos), and contemporary music. The saxophone is also used as a solo and melody instrument or as a member of a horn section in some styles of rock and roll and popular music. The saxophone was invented by the Belgian instrument maker Adolphe Sax in the early 1840s and was patented on 28 June 1846. Sax invented two groups of seven instruments each—one group contained instruments in C and F, and the other group contained instruments in B♭ and E♭. The B♭ and E♭ instruments soon became dominant, and most saxophones encountered today are from this series. Instruments from the series pitched in C and F never gained a foothold and constituted only a small fraction of instruments made by Sax. High-pitch (also marked "H" or "HP") saxophones tuned sharper than the (concert) A = 440 Hz standard were produced into the early twentieth century for sonic qualities suited for outdoor use, but are not playable to modern tuning and are considered obsolete. Low-pitch (also marked "L" or "LP") saxophones are equivalent in tuning to modern instruments. C soprano and C melody saxophones were produced for the casual market as parlor instruments during the early twentieth century, and saxophones in F were introduced during the late 1920s but never gained acceptance. The modern saxophone family consists entirely of B♭ and E♭ instruments. The saxophones in widest use are the B♭ soprano, E♭ alto, B♭ tenor, and E♭ baritone. The E♭ sopranino and B♭ bass saxophone are typically used in larger saxophone choir settings, when available. In the table below, consecutive members of each family are pitched an octave apart.