Enharmonic Tetrachords in Byzantine Music
In Byzantine music, enharmonic describes a kind of tetrachord and the echos that contain them. As in the ancient Greek system, enharmonic tetrachords are distinct from diatonic and chromatic. However Byzantine enharmonic tetrachords bear no resemblance to ancient Greek enharmonic tetrachords. Their largest division is between a whole-tone and a tone-and-a-quarter in size, and their smallest is between a quarter-tone and a semitone. These are called "improper diatonic" or "hard diatonic" tetrachords in modern western usage.
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