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(Gk.: ‘eightfold sound’)
  • Peter Jeffery


The system of the eight ‘church modes’ (the ‘musical’ oktōēchos) in the medieval Latin, Byzantine, Slavonic, Syrian, Armenian and Georgian repertories of Christian liturgical chant. Also, by association, the practice of grouping chants by mode (the ‘calendric’ oktōēchos) so that they can be sung in numerical order over a period of time, usually one mode per week, proceeding to the next higher number each Sunday and beginning with the 1st mode again when the 8th is completed. And a book (the ‘liturgical’ ...

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