proportions

Japanese: proportio
proportions

...This comprehensive concept of music collapsed in the Middle Ages in Europe, and was replaced by the concept of music as a speculative science, which was placed in the seven liberal arts, and the concept of practical music, which actually resonates on the premise of the act of performance. The latter gradually evolved into a sophisticated sound structure that included rhythm theory and pitch theory as polyphonic music developed from the Middle Ages to the Renaissance. These practical musics and their theories have inherited from ancient Greece the idea that the basis of musical construction is a rationally divisible relationship (ratio) and numerical proportion (proportio). This spirit of valuing rational divisibility and numerical proportion can also be seen in ancient Chinese theory of music, but the Western concept of composition was characterized by its attempt to create a sophisticated sound structure by applying it to rhythm theory, the theory of pitch and harmony, the structure of phrases and musical sections, and almost all other relationships in which parts correspond to the whole. …

*Some of the terminology explanations that mention "proportio" are listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…このように包括的な〈音楽〉の概念は,ヨーロッパ中世においては崩壊し,それに代わって思弁的な学として〈自由七科septem artes liberales〉の中に位置づけられる〈音楽〉と演奏行為を前提として実際に鳴り響く実践的な〈音楽〉の概念が生まれたが,後者は中世からルネサンスにかけてのポリフォニー音楽の発展につれて,しだいにリズム理論,音程理論などを内部に含む精緻な音の構築物へと進化した。これらの実践的な音楽とその理論がギリシア古代から一貫して受け継いだのは,音楽的な構築の基礎を合理的に整除できる関係(ラティオratio)と数的比例(プロポルティオproportio)に求める考え方である。合理的に割り切れることと数的比例を重んじるこの精神は,古代中国の音律理論にも見られるところであるが,これをリズム理論,音程とハーモニーの理論,楽節・楽段の構造その他,部分と全体の照応するほとんどすべての関係に及ぼして,精緻な音の構築物を作ろうとするところに西欧的な〈作曲composition〉の特色があった。…

※「proportio」について言及している用語解説の一部を掲載しています。

出典|株式会社平凡社世界大百科事典 第2版について | 情報

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