Every song has its own music theory, and according to the music theory, a song needs to have the following parts: reading spectrum, interval, chord, rhythm, beat and so on. There are relatively advanced contents such as harmony, polyphony, form, melody and orchestration.

And the music theory is to stipulate what these parts need to do to make everyone understand the song.

If you don't know music theory, only the author can understand the songs created at will, and if it is a chorus song, then you need the author to conduct, because the conductor needs to know music theory to conduct, and it is difficult to judge the songs written without music theory, so the singers' songs have certain knowledge of music theory.

If a person has no knowledge of music theory and then writes a song by himself, then he needs to judge whether the song is complete or not.

Step 1: Check whether the reading score, interval, chord, rhythm and beat are complete, because these parts are the most basic components of a song, so if these parts are not complete, the song is not complete enough, it is difficult to understand, and it will make people feel that something is missing.

Step 2: Let a person who can play musical instruments play this song, let him feel if there are any inappropriate places when playing, and let him bring it up, because the most important thing in writing songs is to be able to play. If this song has not been played, it is not a complete song, and it can also help you find out what is not good about this song.

Music theory has a very positive significance for composing, arranging, conducting and playing.