1972
1972 - Ursula Meyer, Conceptual Art (New York: Dutton) p. 172

In Ursula Meyer’s 1972 book Conceptual Art, page 172 presents Max Neuhaus’s shift from traditional music performance to environmental sound works, focusing on spatial location over time. Neuhaus highlights a shift from percussion to "constructing" auditory topographies, where the artwork is the audience’s perception of a physical site.
Walker Art Center