Microtonal intervals: a 12th-century clash of cultures
By Leo Lousberg, Nov 2013
University Library Utrecht, Ms. fr. 4.3’ refers to a collection of twenty folios of manuscript fragments which were once part of a 12th-century antiphonary, and belonged to St Paul’s Abbey in Utrecht. Its musical notation includes symbols for microtonal intervals which point to the survival of local chant traditions despite Roman attempts at standardization.
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http://bc.library.uu.nl/node/809
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