1 The pitch of the sound: Any piece of music is composed of alternating high and low sounds. Looking directly at the piano, the keyboard to the left has a lower sound, and the keyboard to the right has a higher sound. 2. The length of the sound: In addition to the pitch of the sound, another important factor is the length of the sound. The marking of the pitch and length of the sound determines which piece of music is different from other pieces of music, and therefore becomes the most important basic element that constitutes music. 3. The dynamics of music: The dynamics of music is easy to understand, also called intensity. There will always be some notes in a piece of music that are stronger and weaker in some places. Changes in intensity are one of the factors that express emotions in musical works. 4. Sound quality: It can also be called timbre. That is, an instrument or human voice that makes music. Male and female voices singing the same melody have different timbres; violin and piano have different timbres