Kinshincho - Kinshincho

Japanese: 近親調 - きんしんちょう

...There are also various types of intimacy among the 24 keys depending on the depth of the relationship, and generally the more common notes two keys have, the stronger the intimacy. In other words, this intimacy is strongest between two keys that are in a perfect fifth relationship with a certain key, and between the parallel keys of each of these three keys, and these are called the intimacy of each other. In the circle of fifths, there are six intimacy of keys: C major and G major, which is a perfect fifth above, F major, which is a perfect fifth below, and A minor, E minor, and D minor, which are the parallel minor keys of the above three keys....

From [Tonality]

...The theoretical basis for this was given by Rameau's Traité de l'harmonie (1722). There are 24 types of keys, including major and minor, and of these, the keys that are in a relationship of a fifth above or below a key and their parallel minor keys are called related keys (circle of fifths). The relationship between keys creates a relationship of tension and relaxation in the sound phenomenon in the form of a key → modulation to another key → return to the key, and in the 18th century, many instrumental forms that based their musical composition on this key relationship appeared. ...

*Some of the terminology that refers to "incest" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…また24種の調のあいだには関係の深さによって種々の近親関係が存在し，一般に二つの調のあいだに共通音が多いものほど近親性が強い。換言すれば，この近親性はある調と完全5度関係にある二つの調，およびこれら3調それぞれの平行調間において最も強力であり，これらを互いの近親調という。5度圏においてはハ長調と完全5度上のト長調，完全5度下のヘ長調，以上3調の各平行短調にあたるイ短調，ホ短調，ニ短調の合計6調が近親調である。…

【調性】より

…これに理論的根拠を与えたのは，ラモーの《和声論Traité de l’harmonie》(1722)である。　調は長･短合わせて24種となり，このうち，一つの調と上下に5度の関係にある調およびそれらの平行短調を近親調という(5度圏)。調の関係は，主調→他の調への転調→主調への回帰という形で，音現象の上で緊張→弛緩の関係を生み，18世紀にはこの調関係を楽曲構成の基本に置いた多くの器楽形式が現れた。…

※「近親調」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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