In 1978, Max Neuhaus published a postcard "Listen" around his first independant work as an artist. This work, as a "lecture demonstration" , was supposed to refocus people's aural perspective.
"...The first performance was for a small group of invited friends. I asked them to meet me on the corner of Avenue D and West 14th Street in Manhattan. I rubberstamped LISTEN on each person's hand and began walking with them down 14th Street towards the East River. At that point the street bisects a power plant and, as I had noticed previously, one hears some spectacularly massive rumbling. We continued, crossing the highway and walking along the sound of its tire wash, down river for a few blocks, re-crossing over a pedestrian bridge, passing through the Puerto Rican street life of the lower east side to my studio, where I performed some percussion pieces for them..."