1965
Track: Max Neuhaus: Morton Feldman– The King Of Denmark, 7:12
Track: Max Neuhaus: John Cage– 27'10.554" - Realization '65, 9:32
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Max Neuhaus's recording of Morton Feldman's was released in 1967 as part of Aspen Magazine No. 5+6. The piece, a landmark of quiet and indeterminate music, was recorded for the magazine, which was published in a "box" format and included various media, such as records and film.
https://walkerart.org/collections/artworks/aspen-the-magazine-in-a-box-vol-1-no-5-and-6