Bar line painting is used in the obvious part of a musical work to indicate that the music has ended. Two identical bar lines are called double vertical lines, also called composite vertical lines. In music, the vertical line used to divide the beat unit in front of the strong beat is called the bar line. The two bar lines used to indicate the end of the whole song, the one on the right is slightly thicker than the one on the left, which is called the termination line.

Extended data:

Generally speaking, there are four basic elements in the composition of all music, the most important of which are "the level of sound" and "the length of sound":

1. Tone level: Any music is composed of high notes and low notes. Looking directly from the piano, the keyboard sound is low left and high right. As far as digital symbols are concerned, there are many dots. ":"Symbol directly above or below a number. Points can be understood as intensity, the more the stronger, representing the upper treble and the lower bass. The principle is the vibration frequency of the object. The higher the treble, the higher the vibration frequency, and vice versa.

2, the length of the sound: In addition to the level of the sound, there is another important factor is the length of the sound. The annotation of pitch and length determines that this piece of music is different from other pieces, so it becomes the most important basic element of music. This principle is expressed as the duration of sound.

3, the intensity of sound: the intensity of music is easy to understand, also called intensity. There are always some notes in a piece of music that are strong in some places and weak in some places. The change of strength is one of the factors to express emotion in music works. The principle is expressed by amplitude.

Baidu Encyclopedia-Jianpu

Baidu encyclopedia-bar line