Infant tone - infant tone

…In the circle of fifths, there are six closely related keys: C major, G major a perfect fifth above, F major a perfect fifth below, and A minor, E minor, and D minor, which are the parallel minor keys of the above three keys. Regarding the characteristics of the keys, since the 16th century, major keys (major modes) have been considered to be bright, while minor keys (minor modes) are considered to be suitable for dark expressions. In addition, keys with sharps in the key signature (special sharp keys) often express an uplifted mood, while keys with flats (variant keys) often express a calm mood. Furthermore, in the meantone temperament (temperament) before the equal temperament, the tone-based interval structure within the scale differed depending on the key, so it was said that each key had its own unique character (theory of key characteristics). …

*Some of the terminology explanations that refer to "Infant Condition" are listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

…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。　調の性格についていえば，16世紀以来長調(長旋法)は明るく，短調(短旋法)は暗い表現に適するとされ，また調号に嬰記号(シャープ)をもつ調(嬰種調)は高揚した気分を，変記号(フラット)をもつ調(変種調)は沈静した気分を表すことが多い。さらに，平均律以前の中全音律(音律)においては調によって音階内部の音律的な音程構造が異なるので，種々の調はそれぞれ固有の性格をもつとされた(調性格論)。…

※「嬰種調」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