Any music involving electronic processing (e.g., recording and editing on tape) and whose reproduction involves the use of loudspeakers.
In the late 1940s, magnetic tape began to be used, especially in France, to modify natural sounds (playing them backward, at different speeds, etc.), creating the genre known as musique concrète . By the early 1950s, composers in Germany and the U.S. were employing assembled conglomerations of oscillator s, filters, and other equipment to produce entirely new sounds. The development of voltage-controlled oscillators and filters led, in the 1950s, to the first synthesizer s, which effectively standardized the assemblages and made them more flexible. No longer relying on tape editing, electronic music could now be created in real time. Since their advent in the late 1970s, personal computers have been used to control the synthesizers. Digital sampling
composing with music and sounds electronically extracted from other recordings
has largely replaced the use of oscillators as a sound source.