One quarter, with quarter notes as one beat, four beats per bar, and two quarters, with quarter notes as one beat, two beats per bar. The syllables are different, the notes are different, and the sound quality is different. 1. Whole note: A hollow white note without a stem or tail is called a "whole note". It is the big brother of the note family. The duration of other notes is shorter than it and must be based on it. Divide it into two halves.

2. Half notes: White notes with stems and no tails are called "half notes". It is only half the length of a whole note, equal to 1/2 the duration of a whole note;

3. Quarter note: A black note with a stem and no tail is called a "quarter note". It is half smaller than a half note, equal to 1/4 of the duration of a whole note;

4. Eighth note: A black note with a stem and a tail is called an "eighth note". It is half smaller than a quarter note, equal to 1/8 of the duration of a whole note;

5. Sixteenth note: A black note with a stem and two tails is called a "sixteenth note" note". It is half smaller than an eighth note, equal to 1/16 of the duration of a whole note;

6. Thirty-second note: The black note with stems and 3 tails is called "thirty" Half note”. It is half smaller than a sixteenth note and equal to 1/32 of the duration of a whole note;

7. Sixty-fourth note: The black note with four stems and tails is called "sixty-four" diaeresis". It is one half smaller than a thirty-second note and equal to 1/64 of the duration of a whole note.