The functions of harmony in music include the combination of voices, the structure of music, the expression of content, and the enrichment of colors.

1. The combination of voices: The first role of harmony in music is the combination of voices. Through the vertical structure of harmony, different pitches sound simultaneously according to certain rules to form chords. This combination allows the various voices to coordinate with each other to form a harmonious whole.

2. The structural role of music: The second role of harmony in music is the structure of music. Through the horizontal movement of harmony, that is, the sequential connection of various chords, harmonic progression forms the basic framework of the music. The harmonic progression gives the music a distinct sense of passage in time, forming phrases, sections and other structures.

3. The expression of content: The third role of harmony in music is the expression of content. Different harmonic colors, harmonic textures, and harmonic progression methods can express different musical contents. For example, major triads give a broad, bright feel, while minor triads give a melancholy, soft feel.

4. The rich role of color: The fourth role of harmony in music is the rich role of color. Through the use of harmony, musical works can show rich color changes. This color change includes not only the timbre of the harmony itself, but also the various changes in pitch, timbre, and volume produced when the harmony progresses.

Characteristics of harmony:

1. The characteristics of harmony are first reflected in the diversity and unity of interval combinations. Different chord structures contain rich interval relationships, both It can express emotional colors of tension and conflict, and can also build a harmonious and stable emotional atmosphere.

2. Harmony has functional characteristics. Different types of chords play specific functional roles in musical works. For example, the main chord represents stability and a sense of belonging, while the secondary dominant chord brings expectation and driving force. , thereby promoting the development and changes of music.

3. The color characteristics of harmony are one of its unique charms. Different chord configurations will create different musical tones. For example, major chords give people a bright and open feeling, while minor chords have a sense of harmony. A melancholy and deep atmosphere.

4. Harmony also has dynamic and evolutionary characteristics. Through the continuous conversion of chords and the design of the harmonic process, music can show a variety of emotional ups and downs, from tension to release, from calm to climax, etc. This gives the work rich inner tension and depth of expression.