Harmony is a sound combination formed by two or more different notes sounding at the same time according to certain rules
To put it bluntly, it is to study how to proceed from one chord to another. Sounds good and reasonable.
Chord is the basic material of harmony. It consists of 3 or more different tones, which are combined simultaneously according to the superposition of thirds or other methods. This is the vertical structure of harmony.
Harmonic progression refers to the sequential connection of chords, which is the lateral movement of harmony. I would like to add that harmony has obvious color effects of thick, light, thick and thin; it also has the function of forming phrases, dividing sections and terminating the music.
Extended information
The development of harmony
The historical development of harmony The formation and development of harmony in Western music has a history of more than a thousand years
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From the 10th to the 16th century, European polyphonic music developed from the early Organon to the perfect stage of polyphonic writing. When the harmony of the various parts of polyphonic music was counterpointed with each other, the consonance intervals were the main ones, that is, Forming harmonic intervals, chords and harmonic progression
In the 17th century, in the early Baroque era, with the formation of single-melody music and the emergence of opera, the method of adding chordal accompaniment to single-voice singing was adopted.
In the second half of the 18th century, the main music system of the classical music period became the main system. The simple and clear characteristics of ideological content and structural form that were pursued at that time were also reflected in the simplicity of harmonious techniques.
In the 19th century, the romantic period and the beginning of the 19th century, the harmonic techniques were basically the same as those in the late last century. Since then, due to the expansion of subject matter and content range, as well as the need for emotional expression in musical works, composers have continued to develop new harmonic vocabulary and enrich harmonic expression.
In the 20th century, based on the development of major and minor system harmony to its limit in the late 19th century, many composers explored new creative techniques or returned to ancient musical styles. The results broke the past 200 years of traditional harmony.
Baidu Encyclopedia-Harmony