Descending scale - Kako Onkai

Japanese: 下行音階 - かこうおんかい
Descending scale - Kako Onkai

...In Western Asia, there is also a theory that ignores minute differences in pitch for practical purposes, divides an octave into 24 scales, and systems maqams using symbols to represent 1/4 and 3/4 tones. Temperament [Oriental]
[Relationship with melody type and mode]
Unlike a melody, a scale is a sequence of tonal materials arranged in order of pitch, but when considering the characteristics of the connections between tones in an actual melody, it can be thought of as not only an ascending scale, but also a descending scale. Some Indian ragas have a zigzag progression with alternating ascending and descending tones, but it is somewhat of a stretch to include these in a scale.

*Some of the terminology explanations that refer to "descending scales" are listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…また西アジアでは実用的に微小な音程の差を無視して,1オクターブを24律に分け,1/4音や3/4音を表示する記号を用いてマカームを体系づける理論もある。音律[東洋]
[旋律型・旋法との関係]
 音階は旋律とちがって,用いられる音素材を音高順に並べたものであるが,実際の旋律における音のつながりの特徴を織り込むと,単なる上行音階ascending scaleだけでなく,下行音階descending scaleも考えられる。インドのラーガには上行・下行が交替してジグザグ進行するものもあるが,これを音階に含めるのは多少無理がある。…

※「下行音階」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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