Musique concrète in the context of "Sound collage"

A definition of music endeavors to give an accurate and concise explanation of music's basic attributes or essential nature and it involves a process of defining what is meant by the term music. Many authorities have suggested definitions, but defining music turns out to be more difficult than might first be imagined, and there is ongoing debate. A number of explanations start with the notion of music as organized sound, but they also highlight that this is perhaps too broad a definition and cite examples of organized sound that are not defined as music, such as human speech and sounds found in both natural and industrial environments. The problem of defining music is further complicated by the influence of culture in music cognition.

The Concise Oxford Dictionary defines music as "the art of combining vocal or instrumental sounds (or both) to produce beauty of form, harmony, and expression of emotion". However, some music genres, such as noise music and musique concrète, challenge these ideas by using sounds not widely considered as musical, beautiful or harmonious, like randomly produced electronic distortion, feedback, static, cacophony, and sounds produced using compositional processes which utilize indeterminacy.

Noise music (or simply noise) is a subgenre of experimental music that is characterised by its use of unwanted noise as a primary musical element. The genre has roots in early 20th century avant-garde music, but later drew influence from industrial music. It is characterized by a rejection of conventional music theory and traditional song structures, often featuring little or no melody, rhythm, or harmony. This type of music tends to challenge the conventional distinction between musical and non-musical sound.

"Noise as music" originated as an avant-garde music style in the 1910s through the work of Luigi Russolo an Italian Futurist, who published the manifesto The Art of Noises in 1913. Elements of noise music were later explored by artists in the Dada and Fluxus movements, as well as through electroacoustic music, modern classical and musique concrète. Composers such as John Cage, Edgard Varèse and James Tenney would explicitly use the term "noise" to describe some of their experimental practices. During the 1960s and 1970s, compositions such as Robert Ashley's "The Wolfman" (1964) and Pauline Oliveros "A Little Noise In The System" (1967) were among the earliest examples of contemporary noise music. While works by non-academic artists such as Lou Reed's Metal Machine Music were influential for later noise artists.

Electronic music broadly is a group of music genres that employ electronic musical instruments, circuitry-based music technology and software, or general-purpose electronics (such as personal computers) in its creation. It includes both music made using electronic and electromechanical means (electroacoustic music). Pure electronic instruments depend entirely on circuitry-based sound generation, for instance using devices such as an electronic oscillator, theremin, or synthesizer: no acoustic waves need to be previously generated by mechanical means and then converted into electrical signals. On the other hand, electromechanical instruments have mechanical parts such as strings or hammers that generate the sound waves, together with electric elements including magnetic pickups, power amplifiers and loudspeakers that convert the acoustic waves into electrical signals, process them and convert them back into sound waves. Such electromechanical devices include the telharmonium, Hammond organ, electric piano and electric guitar.

The first electronic musical devices were developed at the end of the 19th century. During the 1920s and 1930s, some electronic instruments were introduced and the first compositions featuring them were written. By the 1940s, magnetic audio tape allowed musicians to tape sounds and then modify them by changing the tape speed or direction, leading to the development of electroacoustic tape music in the 1940s in Egypt and France. Musique concrète, created in Paris in 1948, was based on editing together recorded fragments of natural and industrial sounds. Music produced solely from electronic generators was first produced in Germany in 1953 by Karlheinz Stockhausen. Electronic music was also created in Japan and the United States beginning in the 1950s and algorithmic composition with computers was first demonstrated in the same decade.

Experimental music is a general label for any music or music genre that pushes existing boundaries and genre definitions. Experimental compositional practice is defined broadly by exploratory sensibilities radically opposed to, and questioning of, institutionalized compositional, performing, and aesthetic conventions in music. Elements of experimental music include indeterminacy, in which the composer introduces the elements of chance or unpredictability with regard to either the composition or its performance. Artists may approach a hybrid of disparate styles or incorporate unorthodox and unique elements.

The practice became prominent in the mid-20th century, particularly in Europe and North America. John Cage was one of the earliest composers to use the term and one of experimental music's primary innovators, utilizing indeterminacy techniques and seeking unknown outcomes. In France, as early as 1953, Pierre Schaeffer had begun using the term musique expérimentale to describe compositional activities that incorporated tape music, musique concrète, and elektronische Musik. In America, a quite distinct sense of the term was used in the late 1950s to describe computer-controlled composition associated with composers such as Lejaren Hiller. Harry Partch and Ivor Darreg worked with other tuning scales based on the physical laws for harmonic music. For this music they both developed a group of experimental musical instruments. Musique concrète is a form of electroacoustic music that utilises acousmatic sound as a compositional resource. Free improvisation or free music is improvised music without any rules beyond the taste or inclination of the musician(s) involved; in many cases, the musicians make an active effort to avoid clichés; i.e., overt references to recognizable musical conventions or genres.

Ambient music is a genre of music that emphasizes tone and atmosphere over traditional musical structure or rhythm. Often "peaceful" sounding and lacking composition, beat, and/or structured melody, ambient music uses textural layers of sound that can reward both passive and active listening, and encourage a sense of calm or contemplation. The genre evokes an "atmospheric", "visual", or "unobtrusive" quality. Nature soundscapes may be included, and some works use sustained or repeated notes, as in drone music. Bearing elements associated with new-age music, instruments such as the piano, strings and flute may be emulated through a synthesizer.

The genre originated in the 1960s and 1970s, when new musical instruments were being introduced to a wider market, such as the synthesizer. It was presaged by Erik Satie's furniture music and styles such as musique concrète, minimal music, Jamaican dub music and German electronic music, but was prominently named and popularized by British musician Brian Eno in 1978 with his album Ambient 1: Music for Airports; Eno opined that ambient music "must be as ignorable as it is interesting", however, in early years, there were artists that were pioneers in this genre, like Tangerine Dream, Klaus Schulze, Wendy Carlos, Kraftwerk, etc. It saw a revival towards the late 1980s with the prominence of house and techno music, growing a cult following by the 1990s.

Industrial music (or simply industrial) is a subgenre of experimental music inspired by post-industrial society, initially drawing influences from avant-garde and early electronic music genres such as musique concrète, tape music, noise and sound collage. The term was coined in 1976 by Monte Cazazza and Throbbing Gristle, with the founding of Industrial Records. Other early industrial musicians include NON and Cabaret Voltaire. By the late 1970s, additional artists emerged such as Clock DVA, Nocturnal Emissions, Einstürzende Neubauten, SPK, Nurse with Wound, and Z’EV, alongside Whitehouse who coined the subgenre "power electronics".

During the 1980s, industrial music splintered into a range of offshoots collectively labelled "post-industrial music", these included, EBM, new beat, hard beat, dark ambient, neofolk, power noise, industrial dance, electro-industrial, dark electro, aggrotech, industrial rock, industrial metal, cyber metal, Neue Deutsche Härte, martial industrial, industrial hip-hop and industrial techno. By the 1990s, elements of industrial music were made accessible to mainstream audiences through the popularity of acts such as Nine Inch Nails, Ministry, Rammstein, and Marilyn Manson, all of whom released platinum-selling records.

Electroacoustic music is a genre of Western art music in which composers use recording technology and audio signal processing to manipulate the timbres of acoustic sounds in the creation of pieces of music. It originated around the middle of the 20th century, following the incorporation of electronic sound production into formal compositional practice. The initial developments in electroacoustic music composition to fixed media during the 20th century are associated with the activities of the Groupe de recherches musicales [fr] at the ORTF in Paris, the home of musique concrète, the Studio for Electronic Music in Cologne, where the focus was on the composition of elektronische Musik, and the Columbia-Princeton Electronic Music Center in New York City, where tape music, electronic music, and computer music were all explored. Practical electronic music instruments began to appear in the early 20th century.