Consonant interval

Japanese: 協和音程 - きょうわおんてい（英語表記）consonant interval

A musical term. The degree of consonance or dissonance of intervals varies depending on the era and ethnic group, and the definition of which intervals are considered consonant intervals has changed in various ways among many theorists throughout history. In the 9th and 10th centuries, intervals considered to be consonant intervals were perfect 1sts, 4ths, 5ths, and 8ths, but gradually intervals of 3rds were also recognized as consonant intervals. Today, perfect 1sts, 8ths, 5ths, and 4ths, as well as major and minor 3rds and 6ths, are generally considered to be consonant intervals, with the former classified as perfect consonance intervals and the latter as imperfect consonance intervals.

Source: Encyclopaedia Britannica Concise Encyclopedia About Encyclopaedia Britannica Concise Encyclopedia Information

Japanese:

音楽用語。音程の協和度，不協和度は時代や民族によって異なり，どの音程を協和音程とみなすかは，歴史上多くの理論家によりさまざまに変化してきた。協和音程とみなされる音程は，9～10世紀頃には完全1度，4度，5度，8度であったが，次第に3度音程も協和音程と認められた。現在では一般的に，完全1度，8度，5度，4度，および長・短の3度，6度が協和音程として扱われ，前者は完全協和音程，後者は不完全協和音程として分類される。

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