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• 00:48, 27 March 2026 Vector talk contribs created page Tetrachord (Created page with "thumb|376x376px|A map of tetrachord tunings A '''tetrachord''' is some division of the perfect fourth into three parts, creating four distinct notes (hence tetra-). A '''tetrachordal scale''' is a scale constructed by joining two tetrachords with an interval of 9/8 (because 4/3 * 9/8 * 4/3 is an octave), and is resultantly a heptatonic scale (because the unison and octave are equivalent). Often, the additional assumption is made that the two tet...") Tag: Visual edit