In addition to diatonic triads, every major and minor scale has seven diatonic seventh chords.
（除了全音三和弦，每个大调和小调都有全音七和弦）

Let's examine the diatonic seventh chords of the C major scale.
（我们来看一下C大调的全音七和弦）

First, construct the scale.
（首先建立音阶）

Next, stack three generic thirds on top of each note.
（然后在每个音上向上叠加三度）

Finally, analyze the resulting seventh chords.
（最后得到七和弦）

The first chord is C–E–G–B, a major triad and a major seventh. Therefore, it is a major seventh chord.
（第一个和弦是C-E-G-B，大三和弦加上一个大七度，所以它是一个大七和弦） |

The second chord is D–F–A–C, a minor triad and a minor seventh. Therefore, it is a minor seventh chord.
（第二个和弦是D-F-A-C，小三和弦加上一个小七度，所以它是一个小七和弦） |

The third chord is E–G–B–D, a minor triad and a minor seventh. Therefore, it is also a minor seventh chord.
（第三个和弦是E-G-B-D，小三和弦加上一个小七度，所以它也是一个小七和弦） |

The fourth chord is F–A–C–E, a major triad and a major seventh. Therefore, it is a major seventh chord.
（第四个和弦是F-A-C-E，大三和弦加上一个大七度，所以它是一个大七和弦） |

The fifth chord is G–B–D–F, a major triad and a minor seventh. Therefore, it is a dominant seventh chord.
（第五个和弦是G-B-D-F，大三和弦加上一个小七度，所以它是一个属七和弦） |

The sixth chord is A–C–E–G, a minor triad and a minor seventh. Therefore, it is a minor seventh chord.
（第六个和弦是A-C-E-G，小三和弦加上一个小七度，所以它是一个小七和弦） |

The seventh chord is B–D–F–A, a diminished triad and a minor seventh. Therefore, it is a half-diminished seventh chord.
（第七个和弦是B-D-F-A，减三和弦加上一个小七度，所以它是一个半减七和弦） |

The eighth chord is a repetition of the first (C–E–G–B), making it a major seventh chord.
（第八个和弦重复第一个和弦（C-E-G-B），它是大七和弦） |

The first seventh chord of a major scale will always be a major seventh, the second and third seventh chords will always be minor sevenths, etc.
（大调的第一个七和弦一定是大七和弦，第二个、第三个和弦肯定是小七和弦）

Next, we will uncover the diatonic seventh chords of the C Natural Minor scale.
（接下来我们看一下C的自然小调的全音七和弦）

First, construct the scale.
（首先建立音阶）

Again, stack three generic thirds.
（然后三度叠加）

Finally, let's analyze the resulting seventh chords.
（然后我们分析一下得到的七和弦）

The first chord is C–E-flat–G–B-flat, a minor triad and a minor seventh. Therefore, it is a minor seventh chord.
（第一个和弦是C-降E-G-降B，小三和弦再加一个小七度，所以它是小七和弦） |

The second chord is D–F–A-flat–C, a diminished triad and a minor seventh. Therefore, it is a half-diminished seventh chord.
（第二个和弦是D-F-降A-C，减三和弦再加一个小七度，所以它是半减七和弦） |

The third chord is E-flat–G–B-flat–D, a major triad and a major seventh. Therefore, it is a major seventh chord.
（第三个和弦是降E-G-降B-D，大三和弦再加一个大七度，所以它是大七和弦） |

The fourth chord is F–A-flat–C–E-flat, a minor triad and a minor seventh. Therefore, it is minor seventh chord.
（第四个和弦是F-降A-C-降E，小三和弦再加一个小七度，所以它是小七和弦） |

The fifth chord is G–B-flat–D–F, a minor triad and a minor seventh. Therefore, it is also a minor seventh chord.
（第五个和弦是G-降B-D-F，小三和弦再加一个小七度，所以它是小七和弦） |

The sixth chord is A-flat–C–E-flat–G, a major triad and a major seventh. Therefore, it is a major seventh chord.
（第六个和弦是降A-C-降E-G，大三和弦再加一个大七度，所以它是小七和弦） |

The seventh chord is B-flat–D–F–A-flat, a major triad and a minor seventh. Therefore, it is a dominant seventh chord.
（第七个和弦是降B-D-F-降A，大三和弦再加一个小七度，所以它是属七和弦） |

The eighth chord is a repetition of the first (C–E-flat–G–B-flat), making it a minor seventh chord.
（第八个和弦重复第一个（C-降E-G-降B），它是小七和弦） |

Next, we will discuss the diatonic seventh chords of harmonic minor.
（接下来我们看一下和声小调的全音七和弦）

To convert natural minor to harmonic minor, the seventh tone is raised a half step. Therefore, each B-flat (the seventh tone of C minor) is raised to a B.
（把自然小调的第七个音向上升一个半音即可得到和声小调。降B（C小调的第七个音）就变成了B）

Each chord which contained a B-flat needs to be reanalyzed.
（原来带有降B的所有和弦都要重新分析）

The first chord is now C–E-flat–G–B, a minor triad and a major seventh. Therefore, it is minor-major seventh chord.
（第一个和弦是C-降E-G-B，小三和弦再加一个大七度，所以它是小大七和弦） |

The third chord is now E-flat–G–B–D, an augmented triad and a major seventh. Therefore, it is augmented-major seventh chord.
（第二个和弦是降E-G-B-D，增三和弦再加一个大七度，所以它是增大七和弦） |

The fifth chord is now G–B–D–F, a major triad and a minor seventh. Therefore, it is a dominant seventh chord.
（第五个和弦是G-B-D-F，大三和弦再加一个小七度，所以它是属七和弦） |

The seventh chord is now B–D–F–A-flat, a diminished triad and a diminished seventh. Therefore, it is a fully-diminished seventh chord.
（第六个和弦是B-D-F-降A，减三和弦再加一个减七度，所以它是全减七和弦） |

The eighth chord is a repetition of the first (C–E-flat–G–B-flat), making it a minor-major seventh chord.
（第八个和弦重复第一个和弦（C-降E-G-降B），所以它是小大七和弦） |

Finally, we will discuss the diatonic seventh chords of melodic minor.
（最后，我们来看一下旋律小调的全音七和弦）

To convert harmonic minor to melodic minor, the sixth tone is raised a half step. Therefore, each A-flat (the sixth tone of C minor) is raised to an A.
（将和声小调的第六个音向上升一个半音即可得到旋律小调，将降A（C小调的第六个音）向上移一个半音得到A）

Each chord which contained an A-flat needs to be reanalyzed.
（所有包含降A的和弦都要重新分析）

The second chord is now D–F–A–C, a minor triad and a minor seventh. Therefore, it is a minor seventh chord.
（第二个和弦是D-F-A-C，小三和弦再加一个小七度，所以它是小七和弦） |

The fourth chord is now F–A–C–E-flat, a major triad and a minor seventh. Therefore, it is a dominant seventh chord.
（第四个和弦是F-A-C-E，大三和弦再加一个小七度，所以它是属七和弦） |

The sixth chord is now A–C–E-flat–G, a diminished triad and a minor seventh. Therefore, it is a half-diminished seventh chord.
（第六个和弦是A-C-降E-G，减三和弦再加一个小七度，所以它是半减七和弦） |

The seventh chord is now B–D–F–A, a diminished triad and a minor seventh. Therefore, it is also a half-diminished seventh chord.
（第七个和弦是B-D-F-A，减三和弦再加一个小七度，所以它是半减七和弦） |

Use this chart to reference the diatonic seventh chords in each scale.
（这张表是本课所讲的调式中的全音七和弦）