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Prolation is a term used in the theory of the mensural notation of medieval and Renaissance music to describe its rhythmic structure on a small scale. The term is derived from the Latin ''prolatio'', first used by Philippe de Vitry in describing Ars Nova, a musical style that came about in 14th-century France. Prolation, together with tempus, corresponds roughly to the concept of time signature in modern music. Prolation describes whether a semibreve (whole note) is equal in length to two minims (half notes) (''minor prolation'' or ''imperfect prolation''; in Latin ''"prolatio minor"'') or three minims (''major prolation'' or ''perfect prolation''; in Latin ''"prolatio maior"''). Early medieval music was often structured in subdivisions of three, while the note values 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. The equivalent term in the Italian notation of the fourteenth century is ''"divisio"'', which covers both tempus and prolation. Italian ''divisiones'', first described by Marchetto da Padova, can also allow four minims within a semibreve. For instance ''octonaria'' and ''duodenaria'' place eight and twelve minims in a breve respectively divided into two or three "major" semibreves. ==References== * 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Prolation」の詳細全文を読む スポンサード リンク
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