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Maryanne Amacher (1938 - 2009) was a composer of large-scale fixed-duration sound installations and a highly original thinker in the areas of perception, sound spatialization, creative intelligence, and aural architecture. She is frequently cited as a pioneer of what has come to be called Inchsound art,Inch although her thought and creative practice consistently challenge key assumptions about the capacities and limitations of the genre. Amacher's work anticipates some of the most important developments in network culture, media arts, acoustic ecology, and sound studies, yet due to it's expansive interdisciplinary nature it has rarely been documented. Following two CDs for Tzadik and her inclusion in the monumental collection OHM The Early Gurus Of Electronic Music (1948-1980), this publication of Amacher's 1991 piece Petra marks her first commercially available instrumental work as well as the first time her music has ever been available on vinyl.Petra was originally commissioned for the ISCM World Music Days in Switzerland. Written for two pianos, the piece is a unique example of Amacher's late work, a direct extension of her working methodologies for electronic composition taken into an acoustic realm that alludes to the music of Giacinto Scelsi and Galina Ustvolskaya. Petra is a sweeping, durational work based on both Amacher's impressions of the church in Boswil where the piece was premiered and science-fiction writer Greg Bear's short story of the same name, in which gargoyles come to life and breed with humans in a post-apocalyptic Notre Dame.This solemn interpretation of Petra was recorded at it's 2017 American premiere at New York's St. Peter's Episcopal Church with pianists Marianne Schroeder, who originally performed the piece alongside Amacher in 1991, and Stefan Tcherepnin, who performed it alongside Schroeder in 2012 at Hamburger Bahnhof, Berlin. Weighi
