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Prolation
 

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Prolation




Prolation, together with Tempus , corresponds roughly to the concept of Time Signature in modern music. Prolation describes whether a Semibreve is equal in length to two Minim s (''minor prolation'' or ''imperfect prolation'') or three Minim s (''major prolation'' or ''perfect prolation'').

Early medieval music was often structured in subdivisions of three, while the Note Value s in modern music are unambiguously subdivided into two parts, meaning that only minor prolation has survived in our time signature system. We now indicate subdivisions of three by modifying note values with dots or triplets. The history of written medieval music shows a gradual shift from major to minor prolation being common.


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