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Electronic music is music that employs electronic musical instruments and electronic music technology in its production, an electronic musician being a musician who composes and/or performs such music. In general a distinction can be made between sound produced using electromechanical means and that produced using electronic technology.〔"The stuff of electronic music is electrically produced or modified sounds. ... two basic definitions will help put some of the historical discussion in its place: purely electronic music versus electroacoustic music" ().〕 Examples of electromechanical sound producing devices include the telharmonium, Hammond organ, and the electric guitar. Purely electronic sound production can be achieved using devices such as the theremin, sound synthesizer, and computer.〔"Electroacoustic music uses electronics to modify sounds from the natural world. The entire spectrum of worldly sounds provides the source material for this music. This is the domain of microphones, tape recorders and digital samplers … can be associated with live or recorded music. During live performances, natural sounds are modified in real time using electronics. The source of the sound can be anything from ambient noise to live musicians playing conventional instruments" ().〕 The first electronic devices for performing music were developed at the end of the 19th century, and shortly afterward Italian Futurists explored sounds that had previously not been considered musical. During the 1920s and 1930s, electronic instruments were introduced and the first compositions for electronic instruments were composed. By the 1940s, magnetic audio tape allowed musicians to tape sound 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. Electronic music was also created in Japan and the United States beginning in the 1950s. An important new development was the advent of computers for the purpose of composing music. Algorithmic composition was first demonstrated in Australia in 1951. In America and Europe, live electronics were pioneered in the early 1960s. During the 1970s to early 1980s, the monophonic Minimoog became the most widely used synthesizer in both popular and electronic art music. In the 1970s, electronic music began having a significant influence on popular music, with the adoption of polyphonic synthesizers such as the Yamaha GX-1 and Prophet-5, electronic drums, and drum machines such as the Roland CR-78, through the emergence of genres such as krautrock, disco, new wave and synthpop. In the 1980s, electronic music became more dominant in popular music, with a greater reliance on synthesizers, and the adoption of programmable drum machines such as the Roland TR-808 and TR-909 and the Linn LM-1, and bass synthesizers such as the Roland TB-303. In the early 1980s, a group of musicians and music merchants developed the Musical Instrument Digital Interface (MIDI), and Yamaha released the first FM digital synthesizer, the DX7. Electronically produced music became prevalent in the popular domain by the 1990s, because of the advent of affordable music technology.〔"Electronically produced music is part of the mainstream of popular culture. Musical concepts that were once considered radical—the use of environmental sounds, ambient music, turntable music, digital sampling, computer music, the electronic modification of acoustic sounds, and music made from fragments of speech-have now been subsumed by many kinds of popular music. Record store genres including new age, rap, hip-hop, electronica, techno, jazz, and popular song all rely heavily on production values and techniques that originated with classic electronic music" (). "By the 1990s, electronic music had penetrated every corner of musical life. It extended from ethereal sound-waves played by esoteric experimenters to the thumping syncopation that accompanies every pop record" ().〕 Contemporary electronic music includes many varieties and ranges from experimental art music to popular forms such as electronic dance music. ==Origins: late 19th century to early 20th century== Lee de Forest's 1906 invention, the triode audion tube, later had a profound effect on electronic music. It was the first thermionic valve, or vacuum tube, and led to circuits that could create and amplify audio signals, broadcast radio waves, compute values, and perform many other functions. Before electronic music, there was a growing desire for composers to use emerging technologies for musical purposes. Several instruments were created that employed electromechanical designs and they paved the way for the later emergence of electronic instruments. An electromechanical instrument called the Telharmonium (sometimes Teleharmonium or Dynamophone) was developed by Thaddeus Cahill in the years 1898 to 1912. However, simple inconvenience hindered the adoption of the Telharmonium, due to its immense size. One early electronic instrument often mentioned may be the theremin, invented by Professor Léon Theremin circa 1919–1920.〔. Note: Historically, world's first electronic musical instruments ''using active component'' may be the Audion Piano developed in 1915 by Lee de Forest who also invented audion tube, the first active component for amplification and oscillation. However at that era, also passive components were researched for oscillation (ex. intermittent glow discharge of neon tubes ()), and possibly more earlier electronic musical instruments might be found.〕 Other early electronic instruments include the Audion Piano invented in 1915 by Lee de Forest who was inventor of triode audion as mentioned above, the ''Croix Sonore'', invented in 1926 by Nikolai Obukhov, and the ondes Martenot, which was most famously used in the ''Turangalîla-Symphonie'' by Olivier Messiaen as well as other works by him. The ondes Martenot was also used by other, primarily French, composers such as André Jolivet. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Electronic music」の詳細全文を読む スポンサード リンク
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