1, which determines tonality. A song must first distinguish between major and minor. Generally, music in major begins with one of the notes of 135 and ends with one of the notes of 15. A minor starts with 36 and ends with 6.
2. Chord matching. A chord with a familiar key often has the sounds of 135, so it can be judged as a major; That is, C in major and Am in minor often appear 135, which can be judged as major; First, arrange the chords for the song, and then convert them into actual keys through the relationship between keys.
3. First, match the bars at the beginning and end of the song with the chords. C in major and Am in minor.
4. The last bar is usually accompanied by a dominant chord or the seventh chord. G or G7 in major and Em or E7 in minor.
5. If it is suitable before the seventh chord, it is best to match the subordinate chord. F major and Dm minor.
6. Generally speaking, the root sound of a chord is good at 357 degrees retrograde and bad at 357 degrees forward.
On the basis of the initial chord, it is necessary to use the functions of chords at all levels on the scale to find proxy chords and beautify them again: the first-order chord, that is, the main chord C, is the only chord that plays a decisive and controlling role, so it is often used at the beginning and end. The second-order chords Dm, D7 and Dm7 can be used as the first-order chords of G7, because their timbre is close to that of G7, which makes the chords smoother.
Third-order chords e and Em are weak chords, which are usually used as proxy chords of first-order chords when the first-order chords occupy too many bars. The fourth chord F is based on the fourth note of the scale, which changes the timbre of the chord and is used to connect the dominant chord and the dominant chord. The fifth-order chords G and G7 are strongly close to the main chord, so they are also called leading chords.
The timbre of the sixth chord Am chord is between the first chord and the fourth chord, which can be used to represent these two chords or to connect them.
Extended data:
Chord arrangement at the end of the song:
1, big mode (1) c-cmaj7 (2) c-FM-c (3) c-ba-c (4) c-be-c.
2, in minor (1) am-dm6 (2) am-a.
In pop music, only major chords are generally talked about, and minor chords are rarely redefined as a mode, because the use of major and minor chords is very common in pop music, and it will be confusing if it is explained by classics and acoustics.
References:
Baidu encyclopedia-chords