Tetrachord

The structural module or motif of ancient Greek scales consisted of four notes spanning a Perfect Fourth. These four notes divided the Fourth into three intervals, the largest of which, the C.I., determined the genus as Diatonic, Chromatic or Enharmonic.

Tetrachordally derived scales are still prominent in the music of India, the European cultural area, and the Islamic countries.

[from John Chalmers, Divisions of the Tetrachord]

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See my Tutorial on Ancient Greek Tetrachord-theory for more info.

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For many more diagrams and explanations of historical tunings, see my book. If you don't understand my theory or the terms I've used, start here

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