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The musical system of ancient Greece evolved over a period of more than 500 years from simple scales of tetrachords, or divisions of the perfect fourth, to The Perfect Immutable System, encompassing a span of fifteen pitch keys.
Any discussion of ancient Greek music, theoretical, philosophical or aesthetic, is fraught with two problems: there are few examples of written music, and there are many, sometimes fragmentary theoretical and philosophical accounts. This article provides an overview which includes examples of different kinds of classification while also trying to show the broader form evolving from the simple tetrachord to system as a whole.