It is well known that a chord inversion occurs when the bass note is not the triad´s fundamental. In the case of the vii°, the bass note would be the third of the chord. When in C major, the seventh grade is B, D, F, therefore vii° would be D,F,B.

When using a four note chord doubling the fundamental, vii° logically becomes D,F,B with an extra B. Having two sensitive notes produces the senstaion of unstability, it is then accoustomed to double the third instead. In the given example vii⁶ would become D F B D.

The reader´s next question would probably be: “When am I going to use vii⁶ (which is the same of B°/D)?”

It can be used to change I⁶ back to I giving the sense of a V-I cadence. In most cases it can even substitute a V⁴ ₃ (V7/D) chord, since it is almost identical except for one note.

As we have prevoiusly done with other musical concepts we leave a small piece for voice and piano to exemplify a usage of this chord.

The reader can listen to the piece in the following link: