
The tension of the dominant V chord resolves to the tonic I chord. Music's strongest harmonic movement is found in major keys where the V chord moves to the I chord. Then, I will explain how the same sound is often applied in minor keys.

First, we will review how V chords work in major keys.

Let's look at what happens in this special situation. In minor keys, however, there is a frequent harmonic “adjustment” made where the minor v chord of the natural minor scale is changed into a major triad or dominant 7th chord. The notes in these chords all come from the A natural minor scale. For example, in the key of A Minor the chord built on the fifth of the scale is an Em (E G B) or Em7 (E G B D). The v chord, when derived from the notes of the natural minor scale, falls as a minor triad or minor 7th chord. Minor keys revolve around the natural minor scale. In minor keys, there is more to understand about the v chord.
