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What Causes Absence of Relative Pitch? For grades 6 thru 10 Category: Behavioral Science Hypothesis: Subjects with Lost-Key or Atonal phenotypes will have a measurable defect either in hearing or in encoding/retrieving relative pitch intervals (memory). Primary Materials Used: Accordian, Electronic Keyboard, Chromatic Tuner Click Here for more details about the "What Causes Absence of Relative Pitch?" science fair project.