How to match chords:

1. Tendency of fourth degree

From the minor key, there is a tendency relationship between chords, and the main chord tends to the subordinate. Chords, dominant chords tend to be dominant chords. Still taking the key of C as an example, C tends to F and G tends to C, then in the chord configuration we can use the connection of C--F, G--C. This progression is very smooth and sounds very comfortable. The essential reason is due to the tendency of the root sound. The root note of C is 1, and the root note of F is 4. The two are related in a pure fourth degree. 1 tends to 4, and C tends to F. It can be said that all chords tend to have their root a perfect fourth above their root. Then the regularity will come out immediately: A--D, E7--A, A7--D, etc.

2. Third-degree tendency

It is this tendency between chords and the difference in the strength of the tendency that makes the chord arrangement of the song have ups and downs. , so that the chord progression of the music reflects movement and avoids monotony. It should be noted that the tendency is not absolute, and there are often practices that break the rules in specific arrangements, which depends on the specific situation.

3. The basic system of chord matching in the minor key

The chord system of C major in the minor key is based on C chord, G chord, and F chord. These three chords are It can complete the main support for songs in the key of C major, in which C is the dominant chord, G is the dominant chord, and F is the subordinate chord; similarly, the three chords Am chord, Em chord and Dm constitute the chord skeleton of A minor. For a song, only these three chords can fully undertake the entire chord arrangement task.

Extended information:

1. There is a general third-degree relationship between the notes in the chord, but there are also non-third-degree relationships. Different chords have different color attributes and can achieve different sound effects, which makes the configuration of chords a very important content in music theory. Chords are generally triads, and the three notes from low to high are called root, third, and fifth respectively. If it's a seventh chord, there's an extra seventh note.

2. Generally speaking, when the root note of a chord progresses according to the retrograde 357, it is a good progression, while the antegrade 357 is a bad progression. It is necessary to build on the initially arranged chords. Use the functions of chords at all levels on the scale to find proxy chords to beautify the chords again.

3. First of all, you must distinguish whether a song is in a major key or a minor key. Generally, songs in major keys usually start with one of the notes of 135 and end with one of the notes of 15; songs in minor keys start with 36 and end with 6. So if a song ends on tonic 1 it's probably in a major key, and if it ends on tonic 6 it's probably in a minor key. But if the end of the song is neither 1 nor 6, it is necessary to analyze the tonal tendency of the song melody.

Reference: Baidu Encyclopedia-Chords