Idiom-What does the eye in the eye actually mean?

In China traditional music, the strong beat and weak beat are represented by "board" and "eye" respectively. The board is a strong beat and the eyes are a weak beat, both of which are 1/4 beats. So "one board with one eye" is 2/4 beat, and "one board with three eyes" is 4/4 beat. Later, it also refers to things that are rigid, such as 4\4 beats.

Beat classification

Beat, an organizational form in music that expresses the time value of a fixed unit and the law of strength and weakness. Also known as beat. The cycle of strong beat and weak beat in each bar is called double beat; The cycle of strong beat, weak beat and weak beat is called triple beat. A symbol indicating the time length and quantity of the basic unit beat in each bar is called the time signature. The number above the time signature indicates the number of beats in each bar, and the number below indicates the duration of each beat.

For example, 2/4 means that there are 1 beats in a quarter note, and each bar has 2 beats. The actual time of the time value in the time signature should depend on the speed of the music mark. In different beat types, only one beat in each bar is called single beat, such as 2/4 and 2/8 are single 2 beats, and 3/4 and 3/8 are single 3 beats.

A beat with one strong beat and two strong beats in each bar is called double beat. For example, 4/4 and 6/8 are double beats, and 9/8 and 9/ 16 are triple beats.