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Achille-Claude Debussy (pronounced [aʃil klod dəbysi]) (August 22, 1862 – March 25, 1918) was a French composer. Along with Maurice Ravel, he is considered one of the most prominent figures working within the field of Impressionist music, though he himself intensely disliked the term when applied to his compositions. Debussy was not only among the most important of all French composers but also was a central figure in all European music at the turn of the twentieth century.

Debussy's music virtually defines the transition from late-Romantic music to twentieth century modernist music. In French literary circles, the style of this period was known as Symbolism, a movement that directly inspired Debussy both as a composer and as an active cultural participant.



“Music is the arithmetic of sounds as optics is the geometry of light.”
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“Music is the expression of the movement of the waters, the play of curves described by changing breezes.”




https://thinkexist.com/quotes/claude_debussy/
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Given that Debussy's music is apparently so concerned with mood and colour, it is somewhat unexpected to discover that, according to one author, many of his greatest works appear to have been structured around mathematical models even while using an apparent classical structure such as sonata form.

Howat suggests that some of Debussy's pieces can be divided into sections that reflect the golden ratio, frequently by using the numbers of the standard Fibonacci sequence.[11] Sometimes these divisions seem to follow the standard divisions of the overall structure. In other pieces they appear to mark out other significant features of the music. The 55 bar-long introduction to 'Dialogue du vent et la mer' in La Mer, for example, breaks down into 5 sections of 21, 8, 8, 5 and 13 bars in length. The golden mean point of bar 34 in this structure is signalled by the introduction of the trombones, with the use of the main motif from all three movements used in the central section around that point.[11][page # needed]

The only evidence that Howat introduces to support his claim appears in changes Debussy made between finished manuscripts and the printed edition, with the changes invariably creating a Golden Mean proportion where previously none existed. Perhaps the starkest example of this comes with La cathédrale engloutie. Published editions lack the instruction to play bars 7-12 and 22-83 at twice the speed of the remainder, exactly as Debussy himself did on a piano-roll recording. When analysed with this alteration, the piece follows Golden Section proportions. At the same time, Howat admits that in many of Debussy's works, he has been unable to find evidence of the Golden Section (notably in the late works) and that no extant manuscripts or sketches contain any evidence of calculations related to it.

Influence on later composers

Claude Debussy is widely regarded as one of the most influential composers of the 20th century. His harmonies, considered radical in his day, were influential to almost every major composer of the 20th century, especially the music of Igor Stravinsky, Olivier Messiaen, Bela Bartok, Pierre Boulez, Henri Dutilleux, and the minimalist music of Steve Reich and Philip Glass as well as the influential Japanese composer Toru Takemitsu. He also influenced many important figures in Jazz, most notably Bill Evans,Thelonious Monk,Duke Ellington, Antonio Carlos Jobim, Jimmy Giuffre and Brad Mehldau.

https://en.wikipedia.org/wiki/Claude_Debussy