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How to judge what major and minor a song is?

Judging by the genre:

First of all, it is natural major.

It is also the most commonly used scale, and the scale structure is full half and full half. It is the basic form of major, with brilliant and bright colors.

the second type, harmony major, is seldom used.

reduce the VI tone in natural major by a semitone, so that the tone between VI and VII becomes an increase of two degrees. The color is dim and soft, a bit like a minor.

third, melody major. Use less.

when the melody goes up, it is the same as natural major, but when it goes down, the VI and VII levels should be lowered by a semitone.

Natural minor (natural minor scale): Except key signature, no temporary marks are added at all.

harmony minor (harmony minor scale): because of the concept of acoustic leading tone, the leading tone should be a semitone away from the main tone, so except key signature, raising the seventh note of a natural minor scale by a semitone becomes a harmony minor scale.

Melody minor (Melody minor scale): Apart from key signature, because the harmony minor scale raises the seventh note by a semitone, the difference between the sixth and seventh notes will increase by two degrees (three semitones). In order to facilitate the play of melody, the sixth note is also raised by a semitone when the scale goes up, but it gives people the feeling of major. In order to solve this problem, the sixth and seventh notes will be restored when the scale goes down to form a natural minor scale.

Modern minor scale: In addition to key signature, in the modern harmony, the technology is constantly improving, and the tonality of major and minor tones is no longer very important. The composer needs a new scale, and the modern minor scale appears. Unlike the melody minor scale, the modern minor scale does not restore the sixth and seventh tones when going down.

Alternating major and minor tones: divided from the modern harmony function area, broadly speaking, it refers to the tonality or mode change of music, which can be melodic or harmonic. Simply speaking, mixing major scales or chords in minor makes music more colorful.

Extended information:

The position of minor:

Minor plays a very important role in various genres of China folk songs. On the one hand, it absorbs nutrition from folk songs, songs and other genres, and processes and refines some tracks to make them more mature in art and become an integral part of minor; at the same time, some minor tracks often become the themes and qupai of operas, folk arts and folk music in the process of dissemination.

For example, Macheng Tune, Sizhou Tune and Flying a Kite in Sichuan Qingyin are all developed on the basis of the original minor; Dresser, Embroidered Red Shoes and Cut Flowers in Guangdong music; Jasmine in Shanxi's "Eight Sets" are also included. In short, in the development of folk music, minor can be said to be a kind of folk song category with extremely extensive mass and certain professional characteristics.

Baidu Encyclopedia-Major

Baidu Encyclopedia-Minor