The basic division of note duration is to express the length of time a note lasts in order to accurately express the rhythm and beat of the music in music.

1. Basic beat unit:

The basic beat unit in music is usually a quarter note, which is considered to be the length of a complete beat. Other note durations can be expressed relative to quarter notes.

2. Relative relationship between note durations:

There is a certain relative relationship between note durations, which can be represented by half notes, eighth notes, sixteenth notes, etc. . For example, two eighth notes are equal in duration to one quarter note, and four sixteenth notes are equal in duration to one quarter note.

3. The duration of rests:

Rests are used to express silence or pause in music, and they also have different durations. Similar to notes, the duration of rests can also be divided relatively, such as half rests, eighth rests, etc.

4. Combination of note durations:

In music, note durations can be combined to represent longer or shorter durations. For example, two quarter notes have the same duration as one half note, and two half notes have the same duration as one whole note. Likewise, eighth notes and sixteenth notes can be combined.

5. Dotted note:

A dotted note is a dotted note added to the note, which means that the length of the original duration is increased by half. For example, a dotted quarter note has the same duration as a quarter note plus an eighth note.

6. Division of complete beats:

In music scores, the length of complete beats can be achieved through the combination of different note durations. Common complete beats include four beats, three beats and two beats, which can be composed of different note durations.

Summary:

The basic division of note duration is an important means of expressing rhythm and beat feeling in music. Through the relative relationship of note durations, rest durations, combination methods and the use of dotted notes, the rhythm changes and beats of the music can be accurately expressed, making the music more vivid and powerful.