Major chords are the most common type of chord in Western music. They are characterized by a bright and cheerful sound.

The main difference between a major chord and a minor chord is the interval between the root and the third. In a major chord, the third is a major third (four half steps), while in a minor chord, the third is a minor third (three half steps).

Dominant seventh chords are often used to create tension and resolve to the tonic chord. They are characterized by a strong sense of forward motion and can be used to add drama and excitement to a piece of music.

A perfect cadence is a chord progression that ends on the tonic chord. It is considered to be the most stable and satisfying cadence. An imperfect cadence is a chord progression that ends on a dominant chord. It is considered to be less stable and more open-ended than a perfect cadence.

Harmony plays a vital role in music. It provides a sense of structure and organization by outlining the chords that make up a piece of music. It also adds color and interest to a melody by providing a harmonic context for it. Finally, harmony can create a sense of movement and forward motion by guiding the listener from one chord to the next.