Beat.

in the practice and theory of music, the beat (sub) is the basic unit of time, and it is the beat layer [1]? Pulse on [2]. Beat is generally the rhythm of people standing on tiptoe when listening to music, or the number of performance hours of musicians (in fact, the number is not necessarily correct in theory, and it is often counted as the nearest layer). As a common name, the word "beat" can refer to a series of related concepts such as speed, beat, specific rhythm and rhythm.

Rhythm in music is characterized by repetitive sequences of repeated beats and non-repeated beats (usually called "strong beats" and "weak beats"), and is divided into bars according to the indication of time signature and speed.

The beat level that is faster than the beat layer is the beat layer, and the slower is the beat layer. Beat has been an important element of music since ancient times. Some music genres, such as disco, generally weaken the importance of beat, while funk emphasizes beat in order to cooperate with dance.

Extended information:

Split beat

Beats can be combined into bars or divided into sections. The nature of this combination and subdivision gives birth to the concept of beat. In music, the combination of two beats is called two beats; Every three beats are combined, which is three beats. In music, one beat divided into two is single-beat music, and one beat divided into three is double-beat music.

So there are single double beats (2/4, 4/4, 2/2, etc.), single triple beats (3/4), double double beats (6/8) and double triple beats (9/8). Irregular and sub-beats, that is, Legato beats, need to be marked with numbers (for example, quarter notes are divided into five equal parts). The sub-beat layer is at least two levels lower than the beat layer: if there are quarter notes or dotted quarter notes, the sub-beat should be divided into at least sixteenth notes.