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→Harmonic Function: Leading Chord
The vii chord is called the ''Leading Chord''. Harmonically, it has a dominant function.
== Full Circle Progression ==
C F Bdim Em Am Dm G C
I IV vii iii vi ii V I
e-0---1---1----0---0---1---3---0--
b-1---1---3----0---1---3---3---1--
g-0---2---x----0---2---2---0---0--
d-2---3---3----2---2---0---0---2--
a-3-------2----2---0-------2---3--
e--------------0-----------3------
Now that we know the vii chord, we can play the full circle progression in the key of C Major.
== Dominant Example ==
Let's try it as the main dominant-function chord in a progression:
C F Bdim C
I IV vii I
e-0---1---1----0--
b-1---1---3----1--
g-0---2---x----0--
d-2---3---3----2--
a-3-------2----3--
e-----------------
Rather strong resolution, especially considering the vii itself is so tense with its diminished fifth interval.
== Diminished Fifth Interval ==
The vii chord is the only diatonic chord in any major key to contain the diminished 5th interval. Remember that the most harmonic interval (other than an octave) is the perfect fifth, represented by the simple ratio of 3:2. By contrast, the diminished 5th has a ratio is 17:12. The smaller the denominator, the more harmonic the interval. Let's see all the intervals:
{|class="wikitable"
! Interval Name !! Ratio
|-
| m2 || 16:15
|-
| M2 || 9:8
|-
| m3 || 6:5
|-
| M3 || 5:4
|-
| P4 || 4:3
|-
| d5 || 45:32
|-
| P5 || 3:2
|-
| m6 || 8:5
|-
| M6 || 5:3
|-
| 7 || 9:5
|-
| M7 || 15:8
|}