1978
1978 - Calvin Tomkins, Talk of The Town, "Music Below" New Yorker article. June 5.

Calvin Tomkins' 1978 New Yorker article "Music Below" profiled Max Neuhaus’s Times Square sound installation, detailing the subtle, resonant electronic hum emerging from a pedestrian island grating. The piece established the concept of an "aural island" and "metaperceptual" listening, which influenced later international commissions like the 1983 Paris Métro project with Philippe Essig.

https://www.newyorker.com/magazine/1978/06/05/music-below#:~:text=Max%20Neuhaus%20turns%20subways%2C%20sculpture,satisfying%20is%20its%20sole%20purpose.