Electronic music

Electronic music is music which is made with electronic equipment such as synthesizers or computers. Sometimes electronic music artists create special sounds using tape recorders too.

After World War II, when tape recorders had been invented and were becoming popular, composers started to use them to make music. The tape recorder was needed for the performance. Composers used them to combine lots of different sounds. Sometimes it was music played on ordinary (acoustic) instruments which was then changed in some way by the tape recorder. Sometimes they took sounds from everyday life such as the sound of water, traffic noise or bird song. All these noises were put together in the way the composer wanted by using the tape recorder. Tapes of sounds were often cut into pieces, then the pieces were 'spliced' – put back together in a different order. The results were often very interesting, but there were problems. Some people asked: “Is it music?” Others thought it was boring to just look at a tape recorder during a concert instead of being able to watch live musicians play.

Composers in Paris were experimenting with electronic music in the 1940s. They called it “Musique concrète” because they used natural, concrete sounds. (“Concrete” in this sense meant the opposite of “abstract” music which was written down for performance). The sounds were played back at different speeds, combined in lots of ways, played backwards or played continuously (repeated in a 'loop'), or played into a mixer and re-recorded onto another tape recorder. The sounds could be filtered. Effects such as vibrato or echo could be added. Sometimes composers used synthesizers which were machines that could make electronic music in real time. They sounded more like normal instruments than the sound effects on a tape recorder.

Computers have often been used for composing electronic music.