The basic knowledge of music theory includes: 1 Basic knowledge: 1. Melody, also known as melody, is a line of sounds formed according to a certain height, length and strength. It is the most important means to shape the image and soul of music. 2. Rhythm, the relationship between the length and strength of each sound. Because different tones are different in length and strength, the melody must contain rhythm. 3. Beat, even the alternation of strong and weak beats. There are many different combinations of beats, called "beats", and the normal rhythm is carried out according to a certain beat.

Second, sound and pitch: sound is produced by the vibration of objects. There are many sounds in nature that can be felt by our hearing, but not all of them can be used as music materials. The sound used in music is specially chosen by people to express their life, thoughts and feelings in the long-term production. These sounds form a fixed system, which is used to express musical ideas and shape musical images.

Sound has four attributes: high and low, strong and weak, long and short, timbre and so on. The sound level is determined by the number of times (frequency) that an object vibrates in a certain period of time. More vibration frequency and higher sound; Low vibration frequency and low sound. The length of sound is determined by the duration of sound. The duration of the sound is long and the sound is long; The sound duration is short and the sound is short. The strength of the sound is determined by the amplitude (the amplitude of the sound vibration range). Large amplitude and strong sound; The amplitude is small and the sound is weak. The timbre varies with the nature, shape and overtone of the pronunciation body.

3. Musical system: The sum of tones with fixed pitch used in music is called musical system. Tones in a music system are arranged in ascending or descending order, and this arrangement is called a musical sequence. Tones obtained by raising or lowering the basic tone level are called varying tone levels. Raise the basic sound level by a semitone and mark it with "L" or "#"; A flat semitone is marked with "drop" or "b"; The rising tone is marked by "rising again" or "X"; The whole tone is marked by "falling again" or "bb"