七和弦的构成是由四个音按三度叠置而成的一种和弦，其显著特点是 根音（最低音）与冠音（最高音）音相距为七度，故名七和弦，七和弦共有七类，其不协和性及紧张度来自七音。
主七和弦 (Major Seventh Chord)，缩写为X Maj 7, 组成音为 1 3 5 7 小七和弦 (Minor Seventh Chord)，缩写为X-7, 组成音为 1 b3 5 b7
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... 二和弦 Chord of the second 七和弦 Chord of the seventh 六五和弦 Chord of the six-five ...
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属七和弦 dominant seventh chord ; Dominant chord of the seventh ; Dominant Chord ; dominant nineth chord
减七和弦 diminished seventh chord ; Diminished chord of the seventh ; Chord of the diminished seventh
自然七和弦 Diatonic Seventh chord
属七和弦模式 Dominant Seventh chord pattern
小七和弦 Minor Seventh Chord
正七和弦 Primary seventh-chord ; Principle chord of the seventh
中七和弦 Mediant sevonth
下属七和弦 Subdominant seventh
所以你要做的就是在进入第二短的时候，引入一些属七和弦到主和弦的关系。
So what you do is to introduce some kind of a V7 - I relationship when you go to the second line.
所增加的七音在主音和下属音三和弦的情况下成为大七和弦，在自然大音阶的其他音的情况下成为小七和弦。
The seventh so added will be a major seventh in the case of triads on the tonic and subdominant, and a minor seventh in the case of other degrees of the diatonic major scale.
后来在融合了大小调和七和弦以后，12小节布鲁斯就以其低沉忧郁的音质从典型的流行音乐时代脱颖而出。
It was differentiated from the typical tin pan alley popular music of the times by dark tonal qualities which were the result of mixing major, minor and 7th chords with the music.
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