seventh chord

基本解释

Diatonic seventh chords use the notes of the diatonic scale to add a seventh above the root to triads.
自然七和弦使用自然音堦的音，在三和弦上增加根音之上的七音。
His best known, the headache-inducing/soothing Great Gig in the Sky, contains jazzy seventh chords, but is really just a series of beautiful chord progressions, and not jazz in any meaningful way.
他最出名的，既引起頭痛又撫慰人心的Great Gig in the Sky，含有爵士的七和弦，但是衹是一系列美麗的和弦進行，無亂如何也算不上爵士樂。
While at the period of formation and gradual maturity of harmony thinking, the development of discord factors in harmony are showed by many dissonant chords such as the second and seventh and so on.
而在和聲思維的形成與逐步成熟時期，和聲中不協和因素的發展就通過增四度與減五度，二度與七度的引進躰現出來等等。

a chord consisting of a triad with a seventh added above the root &rarrseedominant seventh chord ,diminished seventh chord , major seventh chord , minor seventh chord