Chord is a sound effect formed by several notes played simultaneously.

1. Principles of Acoustics

Chords refer to two or more different notes that are emitted at the same time in music. Through the harmonic effect produced at the same time, a more harmonious sound is formed. Complex, rich and harmonious sound effects. A chord can also be thought of as a group of tones of a specific pitch.

2. Classification and composition of chords

Common chord classifications include triads (consisting of root, third and fifth tones), seventh chords (in the middle of triads) The seventh chord is added on the basis of the seventh chord) and the ninth chord (the second tone is added on the basis of the seventh chord). Different harmonies can be formed depending on factors such as the order of the notes, the way the melody is changed, the scale in which they are located, and so on.

3. Application of chords

Chords are widely used in music creation, performance, accompaniment, etc. In jazz, blues, funk, folk, rock and other music styles, chords are often used as a creative and structural basis for excellent music creation. In accompaniment, chords are widely used in various musical instruments, such as guitar, piano, wind instruments, violin, etc., to form rich sound effects.

4. How to express chords

Chords can be represented by chord symbols, English letters, simplified notation symbols and numbers. Among them, chord symbols such as C, G, D, etc. represent the root notes of the chord, while uppercase letters and lowercase letters represent major and minor chords respectively. The simplified musical notation tends to be more intuitive and clear, but the various expressions (or whole) of the simplified musical notation only represent the main tones of the chord, and do not list other tone ranges and variations.

5. Chord progression and retrogressive progression

Chord progression is the regular jumping or sliding from one chord to another, and makes the rhythm and musicality of the song richer. Typical chord progression patterns include Ⅰ-Ⅳ-Ⅴ, Ⅰ-Ⅲ-Ⅵ-Ⅱ-Ⅴ-Ⅰ, etc. When proceeding with chords, you also need to pay attention to following the rules of music and grasp a series of musical elements such as transposition, subtraction, and tonality.

6. Chord playing skills

When playing chords, there are rich playing skills and artistic processing methods. In terms of performance skills in various musical instruments such as string instruments, wind instruments, and keyboard instruments, chord music on the piano is generally divided into stereo harmony and running harmony. Different skills are required in aspects such as inhalation and exhaust valve ventilation, finger plucking, button pressing or tapping, mouth shape and tongue position.