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pieces involving any kind of electronic (digital or analog) processing of acoustic instruments.
the term is used here in reference to the musical practice that originated in western art music (mostly academic) during the modern era, rather than the broader use of electroacoustic as a branch of acoustic engineering. yet these two definitions are closely related to the other by involving the use of transducers that convert one form of energy (acoustic) into another (electro-magnetic). in western art music the term has become quite blurry over the last decades including everything that is incorporating electric sound production into compositional practice.
i find a limitation based on live- or pre-excecuted signal processing of acoustic sound sources helpful for keeping the term meaningful.