1. After getting a work, consider whether the position of the chord is necessary, whether it is a chord for each bar or a chord for every two beats.
2. If it is a lyric song, then don't arrange chords too densely in the main song, and choose bars to match a chord, so that the accompaniment sounds more lyrical and the emotional expression is more soothing.
3. Select the reference sound of each bar chord and write down the starting melody sound and the longest melody sound of each bar. If the starting melody sound is longer than or equal to 1 beat, the starting melody sound is selected as the reference sound; If the initial melody tone is shorter than 1 beat, the longest melody tone is selected as the reference tone.
4. When using a second chord, generally choose from the second, third and sixth minor chords. When using a chord, first consider that the reference sound is the third sound of the chord, and then consider that the reference sound is the seventh or fifth sound of the chord. Try not to let the reference sound be the root sound of the chord.