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Pauline Oliveros conceived of the Expanded Instrument System (EIS) in the 1960s as an interactive electronic sound processing environment designed for improvising musicians. In the 1990s, with David Gamper and Stuart Dempster, she formed the Deep Listening Band in which Oliveros plays accordian, Gamper plays keyboards, Dempster plays trombone and didjeridoo, and they all play the EIS.

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The photo at the left, by Joel Chadabe, shows the Deep Listening Band performing with The Expanded Instrument System in 1996, in Kingston, New York.

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