Ervin Wilson is an American music theorist whose work, outside of the academic community, is noted for the variety and originality of its ideas. Wilson, despite his avoidance of publication, has been remarkably influential on those interested in microtonal music and just intonation, and is particularly noted for his work with scale construction. Among his ideas here are combination product sets and cross product sets, and the eikosany and hexany in particular. He is also noted for his scales based on recurrence relationships, such as meta-mavila and meta-meantone. Microtonal music is music using microtones -- intervals of less than a semitone, or as Charles Ives put it, the notes between the cracks of the piano. ... In music, Just intonation, also called rational intonation, is any musical tuning in which the frequencies of notes are related by whole number ratios; that is, by positive rational numbers. ...
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