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[colotomy](from Gk. kōlon: ‘section’, ‘limb’)

A term adopted by the ethnomusicologist Jaap Kunst in his work on the gamelan music of Java and Bali, to describe the phrase structure of the gendhing (‘piece’). Each major section of a gendhing begins and ends on a gong beat and is further subdivided into subsections and phrases by several other single-note instruments of the gong type; their function is to mark the skeletal melody (adapted and played by the metallophones in unison) at regular metric periods. Over a dozen different colotomic structures are in regular use, each with its own name such as ...

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Peter Jeffery

(Gk.: ‘eightfold sound’)

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’ oktōēchos) in which the chant texts are grouped by mode in numerical order to facilitate performance according to the calendric oktōēchos (see Liturgy and liturgical books, §IV, 3, (viii)); books also exist in which chants are arranged according to mode but without regard to a calendar, notably the Western Tonary and the Byzantine Heirmologion).

Although many theories regarding the origins of the eight-mode system have been proposed, the earliest genuine evidence of the musical ...