{"value"=>"<p>Files for <span class=\"title\">Rare and Unusual Atmospheres</span>, a research project dealing with perceptual hearing, comprise this subseries. These files largely consist of project descriptions, which include dozens of drafts, most of which are annotated or edited by Amacher, and contain slight variations in text. General notes and sources are also included here. A file titled \"Descriptive Texts for Scenarios\" holds early notes for the project.</p> <p><span class=\"title\">Rare and Unusual Atmospheres</span> builds on \"Psychoacoustic Phenomena in Musical Composition: Some Features of a Perceptual Geography,\" a 1977 talk given by Amacher that she updated in 2008. Materials for the latter are located in box 143, which is held in subseries VI.D.</p>"}