Page "Alvin Lucier" Paragraph 7

Other key pieces include " North American Time Capsule " ( 1966 ), which employed a prototype vocoder to isolate and manipulate elements of speech ; Music On A Long Thin Wire ( 1977 ), in which a piano wire is strung across a room and activated by an amplified oscillator and magnets on either end, producing changing overtones and sounds ; Crossings ( 1982 ), in which tones play across a steadily rising sine wave producing interference beats ; Still and Moving Lines of Silence in Families of Hyperbolas ( 1973 – 74 ), in which the interference tones between sine waves create " troughs " and " valleys " of sound and silence ; and Clocker ( 1978 ), which uses biofeedback and reverberation.