He gave the first performance of Xenakis ' Herma and Eonta.

Helffer gave many premières of new works and was the dedicatee of several notable works, including Erikhthon ( Xenakis, 1974 ), Concerto ( Boucourechliev, 1975 ), Stances ( Betsy Jolas, 1978 ), Concerto no.

World premières he presided over included works by Bussotti, Ferneyhough, Górecki, Ligeti, Rihm, Stockhausen and Xenakis, and he gave the French premières of Hindemith's Symphony Mathis der Maler and Stravinsky's The Rake's Progress and the European premiere of Susman's Trailing Vortices.

A large number of avant-garde composers have attended and given lectures there, including Olivier Messiaen, Luciano Berio, Milton Babbitt, Pierre Boulez, Luigi Nono, John Cage, György Ligeti, Iannis Xenakis, Boris Porena, Karlheinz Stockhausen and Mauricio Kagel.

Machine Improvisation builds upon a long musical tradition of statistical modeling that began with Hiller and Isaacson's Illiac Suite for String Quartet ( 1957 ) and Xenakis ' uses of Markov chains and stochastic processes.

Hartmann also provided a platform for the music of the young composers who came to the fore in the late 1940s and early 1950s, helping to establish such figures as Hans Werner Henze, Luigi Nono, Luigi Dallapiccola, Carl Orff, Iannis Xenakis, Olivier Messiaen, Luciano Berio, Bernd Alois Zimmermann and many others.

Among his most important works are Metastaseis ( 1953 – 4 ) 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.

As an architect, Xenakis is primarily known for his early work under Le Corbusier: the Sainte Marie de La Tourette, on which the two architects collaborated, and the Philips Pavilion at Expo 58, which Xenakis designed alone.

In 1938, after graduating from the Spetsai school, Xenakis moved to Athens to prepare for entrance exams at the National Technical University of Athens.

Xenakis, fearing for his life, deserted and went into hiding.

At the same time, while working for Le Corbusier, Xenakis was studying harmony and counterpoint, and composing.

Xenakis approached Messiaen for advice: should he once again start studying harmony and counterpoint?

Although Scherchen did not premiere that particular work, he did give performances of later pieces by Xenakis, and the relationship between the conductor and the composer was of vital importance for the latter.

In the same year he produced a musique concrète piece, Concret PH, for the Philips Pavilion, and in 1960 Xenakis was well-known enough to receive a commission from UNESCO, for a soundtrack for a documentary film by Enrico Fulchignoni.

Xenakis completed his last work, O-mega for percussion soloist and chamber orchestra, in 1997.

In 1999, Xenakis was awarded the Polar Music Prize " for a long succession of forceful works, charged with sensitivity, commitment and passion, through which he has come to rank among the most central composers of our century in the realm of art music, exercising within its various fields an influence which cannot be readily overstated ".

* Centre for Composition of Music Iannis Xenakis

* Iannis Xenakis Bibliography and Discography compiled by James Harley for Leonardo / ISAST

* The Centre d ' Etudes de Mathématique et Automatique Musicales ( Centre for Automatic and Mathematical Music ) is founded in Paris by Iannis Xenakis.

Xenakis was the first to explicate a compositional theory for grains of sound.

Edgar Varese's Poeme Electronique, created for the Iannis Xenakis designed Philips Pavilion at the 1958 Brussels World's Fair, also utilised spatial audio with 425 loudspeakers used to move sound throughout the pavilion.

Shortly after his first trip to IRCAM, he was also invited to compose a work using the Les Atiliers UPIC System, which Iannis Xenakis had created for Mycenae Alpha ( 1978 ).

* " 3rd bridge ", a guitar technique using the part of the string between the nut and the stopping finger ; see Xenakis ' cello piece Nomos Alpha for a similar effect.

Other examples of music that contain noise-based features include works by Iannis Xenakis, Karlheinz Stockhausen, Helmut Lachenmann, Cornelius Cardew, Theatre of Eternal Music, Rhys Chatham, Ryoji Ikeda, Survival Research Laboratories, Whitehouse, Cabaret Voltaire, Psychic TV, Blackhouse, Jean Tinguely's recordings of his sound sculpture ( specifically Bascule VII ), the music of Hermann Nitsch's Orgien Mysterien Theater, and La Monte Young's bowed gong works from the late 1960s.

He was the eldest son of Klearchos Xenakis, a Greek businessman from Euboea, and Fotini Pavlou from Lemnos.

These included a kindergarten on the roof of an apartment block in Nantes ( Rezé ), parts of government buildings in Chandigarh, India, the " undulatory glass surfaces " of Sainte Marie de La Tourette, a Dominican priory in a valley near Lyon, and the Philips Pavilion at Expo 58 — the latter project was completed by Xenakis alone, from a basic sketch by Le Corbusier.

The third part of the triptych, Metastaseis, is generally regarded as the composer's first mature piece ; it was detached from the triptych to mark the beginning of the " official " Xenakis oeuvre.

He lived in Europe from 1963 to 1966 where he worked with Iannis Xenakis.

Manoury's work is strongly influenced by Pierre Boulez, Karlheinz Stockhausen, and Iannis Xenakis, and his early work from 1972 – 76 combines serial Punctualism with the densely massed elements characteristic of the music of Stockhausen and Xenakis, and the paintings of Jackson Pollock.

At the suggestion of Franco Donatoni he attended the seminars of Iannis Xenakis from 1974 until 1978.

His lyrics have been described as intensely personal and mystical, incorporating recurrent themes from his own personal mythos, and his songwriting and singing have been compared ( usually favourably ) to Syd Barrett and early Pink Floyd, referred by Ka-Spel, as being more a folk coincidence, not a direct influence ... Ka-Spel have mentioned so diverse influences and musical references as: Xenakis, Beatles, Otomo Yoshihide, Radiohead, Nurse With Wound, ( early ) David Bowie, Brainticket, Can, ( early ) The Residents, Magma, Ilicht, Es, Throbbing Gristle, etc.

Edward Ka-Spel has said their musical influences range from the likes of Abba to Iannis Xenakis

The British composer Richard Barrett stands apart from other tendencies in that country, working within a radical atonal avant-garde idiom a little in the manner of the German composers mentioned earlier, but equally influenced by other figures including Stockhausen, Hans-Joachim Hespos, Xenakis, Kagel, Michael Finnissy and others.

Edgard Varèse composed " Poème électronique ," which was recorded to be played back from 425 loudspeakers, placed at specific points in the Philips Pavilion, designed by Iannis Xenakis while under the employ of Le Corbusier.

Oversaw the label's recordings of works by 49 composers from 16 countries, among them Ives, Cage, Nono, Maderna, Stockhausen, Luciano Berio and Iannis Xenakis and the first commercial recordings of Scelsi, Wolff and Bussotti.

Though the notation is not explained in the score, in another work from 1986, Jalons, Xenakis explains that the two notes should be produced with the lips and not with singing.

* Iannis Xenakis: Ikhoor ( 1978 )

Subsequently, one of the first composers to write music with a computer was Iannis Xenakis.

Although Xenakis could well have composed this music by hand, the intensity of the calculations needed to transform probabilistic mathematics into musical notation was best left to the number-crunching power of the computer.

The Greek composer Iannis Xenakis was referred to him in 1951 ; Messiaen urged Xenakis to take advantage of his background in mathematics and architecture in his music.

Iannis Xenakis (, Greek: Γιάννης Ξενάκης ) ( May 29, 1922 – February 4, 2001 ) was a Greek composer, music theorist, and architect-engineer.

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.

Xenakis was born in Brăila, Romania.

His parents were both interested in music, and it was Fotini who introduced the young Xenakis to music.

It was also at the Spetsai school that Xenakis studied notation and solfège, and became enamored with Greek traditional and sacred music.

Xenakis joined the communist National Liberation Front early during the war, participating in mass protests and demonstrations, and later becoming part of armed resistance — this last step was a painful experience Xenakis refused to discuss until much later in life.

In December 1944, during the period of Churchill's martial law, Xenakis ( who was by then a member of the communist students ' company of the left-wing Lord Byron faction of ELAS ) became involved in street fighting against British tanks.

He was gravely wounded when a shell hit his face ; that Xenakis survived the injury has been described as a miracle.

Xenakis was then conscripted into the national armed forces.

In a late interview, Xenakis admitted to feeling tremendous guilt at leaving his country, and that guilt was one of the sources of his later devotion to music:

Although he was an illegal immigrant in Paris, Xenakis was able to get a job at Le Corbusier's architectural studio.

Such was the case with Nadia Boulanger, who was the first person Xenakis approached about lessons.

Xenakis, who was by that time well acquainted with music of Debussy, Béla Bartók, and Stravinsky, all of whom used such devices and much more experimental ones, was furious and left to study with Darius Milhaud, but these lessons also proved fruitless.