High frequency noise (17-18000hertz); some of us could hear it, some noticed a noise, others did not (people above 25 years lose the ability to hear high frequencies)
John Cage: 4`33``(silence). Silence is impossible to hear; hence it is impossible to experience silence. Piece of silence in sonic dead space. Even if it is absolutely silent you still hear noises from your own body.
Alvin Lucier: "I am sitting in a room (with the visuals from YouTube: sitting in a room video codec). Sound is modified by the physical space around it. In this context Karl mentions the start-up Ambisonics; a company that reconstructs acoustical space. One can also imagine sound as a mouldable sculpture.
Karl Salzmann: Echo in a tunnel
Pierre Schaeffer: Etude aux chemins de fer (1948) -> recorded noises made by trains.
Video of John Cage`s water walk from 1960. In this context Black Mountain College was brought up; a progressive art school (1933-1956) where John Cage was teaching.
Experiment with sound wave interference (play both frequencies, 220 hertz and 223 hertz at the same time)
Kurt Schwitters: Ursonate.
Steve Reich: Its gonna rain (original spoken by a preacher)
Composition Crin by Jorge Sanchez-Chiong performed by Patricia Kopatchinskaja.
Another example by Jorge: Used Redux
Johannes Kreidler: Crisis sounds so cool (Microsoft`s Songsmith fed with stock charts)
Music video from Einstürzende Neubauten Autobahn.
Video from Gillian Wearing: 2 into 1 (1997)