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Tetrachord
In musical theory, a tetrachord is a series of four diatonic tones encompassing the interval of a perfect fourth.
Two similar tetrachords, a tone apart, form the diatonic major scale.
- Greek Esoteric Music Theory: The Elemental Tetrachord (http://www.cs.utk.edu/~mclennan/BA/GEM/GEM-ET)
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