Sites which deal with tuning systems (historical and modern), just intonation, and theories of tuning, temperament, and harmelodics.
Just Intonation
Just Intonation is a system of tuning in which all of the intervals can be represented by ratios of whole numbers.
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Magazines and E-zines
Journals, periodicals, magazines, and e-zines about music theory.
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Microtonal
Usually used to describe temperments that are not equal.
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