In ancient Greek music theory, the division or gap between two tetrachords that do not overlap or connect.
From Greek 'dia-' (through, apart) and 'zeuxis' (joining), literally 'a separating' or 'disjunction,' describing the structural space in musical organization.
The Greeks had two ways to arrange tetrachords: 'synaphe' where they connected, and 'diazeuxis' where they were separated—this system of dividing music into chunks is how they organized everything from simple melodies to complex compositions.
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