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Vibrations conducted through a person's bones produce the uncanny sensation of low sounds emanating from within the body. The New York-based artist Sergei Tcherepnin draws on this effect in Stereo Classroom Chairs (2015), mounting a transducer to the underside of each wooden seat on which visitors are invited to sit. When not attached, a transducer plays sounds quietly, at a level that is almost inaudible. When its surface touches another object, however, the material characteristics of that object filter the sounds in various ways. Here, Tcherepnin's audio composition travels through the body of each sitter with a physical intensity. The chair amplifies the composition, while the sitter acts as the filter, amplifying low-frequency sounds and muffling higher frequencies.

RICHARD LERMAN, works in Music, Film, Installations, Performance, and Video. He often constructs functional microphones from diverse materials, and then composes using these transducers to amplify and pick-up sounds of the environment, and allow the sonic flavor of each material to be heard. Recent works combine sounds from his self-built microphones with computer and MIDI techniques. bio from http://www.artifact.com/bio.php?name=Lerman

"This site documents examples discussed in my book Between air and electricity - Microphones and loudspeakers as musical instruments. Although most of these pieces and performances are best experienced live, these audio and video documentations might be helpful to get a better understanding of the music."

"Installation by Brian House creates audio from feedback of four different sheets of metal affected by a realtime feed from water quality sensors examining a polluted river:"

David Tudor and John Driscoll demonstrating the performance installation, Rainforest IV (1973)