?增四度
...新潮的作曲家把调号(Key signature)(注二十五)全舍弃,连同下列的声部(Part)(注二十四)通通用增四度(Augmented fourth)(注二十七)和减五度(Diminished fifth)(注二十八)来表示,而这样的作品就是典型的无调性音乐(Atonality):
The interval of the tritone (an augmented fourth, known as the "devil in music") emerges throughout, lending an eerie, uneasy atmosphere to the work.
WSJ: The Sounds of Sacrifice | Benjamin Britten | War Requiem | Masterpiece by Stuart Isacoff
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