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阶的音,在三和弦上增加根音之上的七音。
Similarly the subdominant , as part of the dominant seventh chord , has a tendency to move to the mediant 下属音也是如此,下属音作为属音七和弦的一部分,倾向于移向中音。
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 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。