Minor seconds and major sevenths are regarded as harsh dissonances , major seconds and minor sevenths as less harsh 小二度和大七度为极不协和音程，大二度和小七度为不协和音程。
2.
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。
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